TWI746738B - 光吸收層、光電轉換元件、及太陽電池 - Google Patents
光吸收層、光電轉換元件、及太陽電池 Download PDFInfo
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- TWI746738B TWI746738B TW106144343A TW106144343A TWI746738B TW I746738 B TWI746738 B TW I746738B TW 106144343 A TW106144343 A TW 106144343A TW 106144343 A TW106144343 A TW 106144343A TW I746738 B TWI746738 B TW I746738B
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- quantum dots
- absorbing layer
- light
- perovskite compound
- photoelectric conversion
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Images
Classifications
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- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/20—Light-sensitive devices
- H01G9/2004—Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
- H01G9/2009—Solid electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0352—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
- H01L31/035209—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions comprising a quantum structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0352—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions
- H01L31/035209—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions comprising a quantum structures
- H01L31/035218—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by their shape or by the shapes, relative sizes or disposition of the semiconductor regions comprising a quantum structures the quantum structure being quantum dots
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
本發明係關於一種用以形成能夠於可見光區域與近紅外光區域之兩區域進行光電轉換之高轉換效率之光電轉換元件及太陽電池的光吸收層、具有該光吸收層之光電轉換元件及太陽電池。本發明之光吸收層含有鈣鈦礦化合物、與包含Cl元素之量子點。
Description
本發明係關於一種光吸收層、具有該光吸收層之光電轉換元件、及具有該光電轉換元件之太陽電池。
將光能轉換為電能之光電轉換元件係利用於太陽電池、光感測器、影印機等。尤其就環境、能源問題之觀點而言,利用作為用之不盡之清潔能源之太陽光的光電轉換元件(太陽電池)備受矚目。
一般之矽太陽電池由於利用超高純度之矽,藉由高真空下之磊晶結晶生長等「乾式製程」而製造等,故而無法期待較大之成本下降。因此,期待藉由塗佈製程等「濕式製程」而製造之太陽電池作為低成本之下一代太陽電池。
作為可藉由「濕式製程」而製造之下一代太陽電池,有量子點太陽電池。所謂量子點係指粒徑約20nm以下之具有結晶結構之無機奈米粒子,藉由表現量子尺寸效果,而顯示出與塊體不同之物性者。例如已知,隨著量子點之粒徑減少,帶隙能增大(吸收波長為短波長化),報告有將粒徑約3nm且帶隙能約1.2eV之硫化鉛(PbS)量子點用於量子點太陽電池(ACS Nano 2014,8,614-622)。然而,以PbS或PbSe量子點為代表之量子點太陽電池雖然能夠進行近紅外光區域(800~2500nm)之光電轉換,但由於帶隙能較小,故而無法獲得高電壓,轉換效率較低。
作為下一代太陽電池之最有力候補,有近年來報告有光電轉換效率
急增之鈣鈦礦太陽電池。該鈣鈦礦太陽電池例如具備將包含甲基銨等陽離子與碘化鉛等鹵化金屬鹽之鈣鈦礦化合物(CH3NH3PbI3)用於光吸收層之光電轉換元件(J.Am.Chem.Soc.2009,131,6050-6051)。鈣鈦礦太陽電池雖然能夠進行可見光區域(400~800nm)之光電轉換,顯示出相對較高之轉換效率,但無法利用近紅外光區域,因此就有效利用太陽光之觀點而言並不充分。
最近,報告有將利用鈣鈦礦化合物(CH3NH3PbI3)進行過表面處理之PbS量子點用於光吸收層之量子點太陽電池(Nano Lett.2015,15,7539-7543)。然而,鈣鈦礦化合物量較少,幾乎無助於鈣鈦礦化合物之發電,轉換效率並不充分。
本發明係關於一種用以形成能夠於可見光區域及近紅外光區域之兩區域進行光電轉換之高轉換效率之光電轉換元件及太陽電池的光吸收層、具有該光吸收層之光電轉換元件及太陽電池。
本發明者等人發現藉由使用含有鈣鈦礦化合物、與包含Cl元素之量子點之光吸收層,會提高光電轉換效率。
即,本發明係關於一種光吸收層,其包含鈣鈦礦化合物、與包含Cl元素之量子點。
藉由使用鈣鈦礦化合物、與包含Cl元素之量子點作為光吸收層之形成材料,由於可吸收除包含鈣鈦礦化合物能夠吸收之短波長區域之光以外,亦包括包含Cl元素之量子點能夠吸收之近紅外等長波長區域之光的寬廣波長區域之光,因此可獲得於寬廣波長區域具有光電轉換功能之光電轉換元件。
又,與使用不含Cl元素之量子點之情形相比,若使用包含Cl元素之量子點,則包含鈣鈦礦化合物與含有Cl元素之量子點的複合膜(光吸收層)之光電轉換效率提高。其原因尚不確定,但推測如下。
藉由在量子點表面存在Cl元素,可降低量子點表面之有機配位基(例如,油酸根陰離子等)量,提高光吸收層中或分散液(例如,以N,N-二甲基甲醯胺為溶劑之液體等)中之量子點之分散性。其結果為,推測由於獲得鈣鈦礦化合物之結晶性較高(微晶直徑較大)、被覆率較高、高品質之光吸收層,故而光電轉換效率提高。又,推測藉由在量子點表面存在Cl元素,而抑制載子自鈣鈦礦化合物向量子點之遷移,提高來自鈣鈦礦化合物之載子提取效率,藉此光電轉換效率提高。
根據本發明,可獲得能夠於可見光區域及近紅外光區域之兩區域進行光電轉換之高轉換效率之光電轉換元件及太陽電池。
1:光電轉換元件
2:透明基板
3:透明導電層
4:阻擋層
5:多孔質層
6:光吸收層
7:電洞傳輸層
8:電極(正極)
9:電極(負極)
10:光
圖1係表示本發明之光電轉換元件之結構之一例的概略剖視圖。
本發明之光吸收層含有鈣鈦礦化合物、與包含Cl元素之量子點作為光吸收劑。再者,本發明之光吸收層亦可於無損本發明之效果之範圍內含有上述以外之光吸收劑。
上述光吸收層有助於光電轉換元件之電荷分離,具有將藉由光吸收產生之電子及電洞分別朝向相反方向之電極進行傳輸的功能,亦稱為電荷分離層或光電轉換層。
上述鈣鈦礦化合物並無特別限制,就提高光電轉換效率之觀點而
言,較佳為選自下述通式(1)所表示之化合物及下述通式(2)所表示之化合物中之1種以上,更佳為下述通式(1)所表示之化合物。
RMX3 (1)
(式中,R為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子)
R1R2R3 n-1MnX3n+1 (2)
(式中,R1、R2、及R3分別獨立為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子,n為1以上且10以下之整數)
上述R為1價陽離子,例如可列舉週期表第一族元素之陽離子、及有機陽離子。作為週期表第一族元素之陽離子,例如可列舉:Li+、Na+、K+、及Cs+。作為有機陽離子,例如可列舉可具有取代基之銨離子、及可具有取代基之鏻離子。取代基並無特別限制。作為可具有取代基之銨離子,例如可列舉:烷基銨離子、甲脒鎓離子及芳基銨離子,就提高光電轉換效率之觀點而言,較佳為選自烷基銨離子及甲脒鎓離子中之1種以上,更佳為選自單烷基銨離子及甲脒鎓離子中之1種以上,進而較佳為選自甲基銨離子、乙基銨離子、丁基銨離子及甲脒鎓離子中之1種以上,更進而較佳為甲基銨離子。
上述R1、R2、及R3分別獨立為1價陽離子,R1、R2、及R3之任一者或全部可相同。例如可列舉週期表第一族元素之陽離子、及有機陽離子。作為週期表第一族元素之陽離子,例如可列舉:Li+、Na+、K+、及Cs+。作為有機陽離子,例如可列舉可具有取代基之銨離子、及可具有取代基之鏻離子。取代基並無特別限制。作為可具有取代基之銨離子,例如可列舉:烷基銨離子、甲脒鎓離子及芳基銨離子,就提高光電轉換效率之觀點而言,較佳為選自烷基銨離子及甲脒鎓離子中之1種以上,更佳為單
烷基銨離子,進而較佳為選自甲基銨離子、乙基銨離子、丁基銨離子、己基銨離子、辛基銨離子、癸基銨離子、十二烷基銨離子、十四烷基銨離子、十六烷基銨離子、及十八烷基銨離子中之1種以上。
上述n為1以上且10以下之整數,就提高光電轉換效率之觀點而言,較佳為1以上且4以下。
上述M為2價金屬陽離子,例如可列舉:Pb2+、Sn2+、Hg2+、Cd2+、Zn2+、Mn2+、Cu2+、Ni2+、Fe2+、Co2+、Pd2+、Ge2+、Y2+、及Eu2+等。上述M就光電轉換效率優異之觀點而言,較佳為Pb2+、Sn2+、或Ge2+,更佳為Pb2+、或Sn2+,進而較佳為Pb2+。
上述X為鹵素陰離子,例如可列舉:氟陰離子、氯陰離子、溴陰離子、及碘陰離子。為了獲得具有目標之帶隙能之鈣鈦礦化合物,上述X較佳為碘陰離子、氯陰離子、或溴陰離子,更佳為碘陰離子、或溴陰離子,進而較佳為溴陰離子。
作為光吸收層中之鈣鈦礦化合物,只要為具有鈣鈦礦型結晶結構之化合物,則無特別限制,就提高光電轉換效率之觀點而言,較佳為具有1.5eV以上且4.0eV以下之帶隙能者。鈣鈦礦化合物可為單獨1種,亦可為帶隙能不同之2種以上。
關於上述鈣鈦礦化合物之帶隙能,就提高光電轉換效率(電壓)之觀點而言,更佳為1.7eV以上,進而較佳為2.0eV以上,更進而較佳為2.1eV以上,更進而較佳為2.2eV以上,就提高光電轉換效率(電流)之觀點而言,更佳為3.6eV以下,進而較佳為3.0eV以下,更進而較佳為2.4eV以下。再者,鈣鈦礦化合物及包含Cl元素之量子點之帶隙能可由藉由下述實施例中所記載之方法於25℃下測得之吸收光譜而求出。將與由吸收光譜求
出之帶隙能對應之波長稱為吸收端波長。
作為具有1.5eV以上且4.0eV以下之帶隙能之上述通式(1)所表示之化合物,例如可列舉:CH3NH3PbCl3、CH3NH3PbBr3、CH3NH3PbI3、CH3NH3PbBrI2、CH3NH3PbBr2I、CH3NH3SnCl3、CH3NH3SnBr3、CH3NH3SnI3、CH(=NH)NH3PbCl3、及CH(=NH)NH3PbBr3等。該等之中,就提高光電轉換效率之觀點而言,較佳為CH3NH3PbBr3、CH(=NH)NH3PbBr3,更佳為CH3NH3PbBr3。
作為具有1.5eV以上且4.0eV以下之帶隙能之上述通式(2)所表示之化合物,例如可列舉:(C4H9NH3)2PbI4、(C6H13NH3)2PbI4、(C8H17NH3)2PbI4、(C10H21NH3)2PbI4、(C12H25NH3)2PbI4、(C4H9NH3)2(CH3NH3)Pb2I7、(C6H13NH3)2(CH3NH3)Pb2I7、(C8H17NH3)2(CH3NH3)Pb2I7、(C10H21NH3)2(CH3NH3)Pb2I7、(C12H25NH3)2(CH3NH3)Pb2I7、(C4H9NH3)2(CH3NH3)2Pb3I10、(C6H13NH3)2(CH3NH3)2Pb3I10、(C8H17NH3)2(CH3NH3)2Pb3I10、(C10H21NH3)2(CH3NH3)2Pb3I10、(C12H25NH3)2(CH3NH3)2Pb3I10、(C4H9NH3)2PbBr4、(C6H13NH3)2PbBr4、(C8H17NH3)2PbBr4、(C10H21NH3)2PbBr4、(C4H9NH3)2(CH3NH3)Pb2Br7、(C6H13NH3)2(CH3NH3)Pb2Br7、(C8H17NH3)2(CH3NH3)Pb2Br7、(C10H21NH3)2(CH3NH3)Pb2Br7、(C12H25NH3)2(CH3NH3)Pb2Br7、(C4H9NH3)2(CH3NH3)2Pb3Br10、(C6H13NH3)2(CH3NH3)2Pb3Br10、(C8H17NH3)2(CH3NH3)2Pb3Br10、(C10H21NH3)2(CH3NH3)2Pb3Br10、(C12H25NH3)2(CH3NH3)2Pb3Br10、(C4H9NH3)2(CH3NH3)2Pb3Cl10、(C6H13NH3)2(CH3NH3)2Pb3Cl10、(C8H17NH3)2(CH3NH3)2Pb3Cl10、
(C10H21NH3)2(CH3NH3)2Pb3Cl10、及(C12H25NH3)2(CH3NH3)2Pb3Cl10等。
光吸收層之鈣鈦礦化合物之微晶直徑,就提高光電轉換效率之觀點而言,較佳為10nm以上,更佳為20nm以上,進而較佳為40nm以上,就相同之觀點而言,較佳為1000nm以下。再者,光吸收層之100nm以下之範圍的微晶直徑可藉由下述實施例中所記載之方法進行測定。又,超過100nm之範圍之微晶直徑無法藉由下述實施例中所記載之方法等進行測定,但不超過光吸收層之厚度。
鈣鈦礦化合物例如可如下所述由鈣鈦礦化合物之前驅物而製造。作為鈣鈦礦化合物之前驅物,於鈣鈦礦化合物為上述通式(1)所表示之化合物之情形時,例如可列舉MX2所表示之化合物與所RX表示之化合物的組合。又,於鈣鈦礦化合物為上述通式(2)所表示之化合物之情形時,可列舉MX2所表示之化合物、與選自R1X所表示之化合物、R2X所表示之化合物及R3X所表示之化合物中之1種以上的組合。
光吸收層之鈣鈦礦化合物例如可藉由元素分析、紅外(IR,infrared)光譜、拉曼光譜、核磁共振(NMR,nuclear magnetic resonance)光譜、X射線繞射圖案、吸收光譜、發光光譜、電子顯微鏡觀察、及電子束繞射等常用方法進行鑑定。
包含Cl元素之量子點係指除構成結晶結構之成分以外亦包含Cl元素之量子點,Cl元素之狀態並無特別限定,較佳為於量子點表面配位有Cl元素之化合物(於構成量子點之金屬元素配位有Cl元素之化合物)。再者,於量子點表面亦可與Cl元素一併配位其他配位基。以下,只要未特別說明,則包含Cl元素之量子點之較佳態樣為除Cl元素以外之配位基之較佳態樣以外,與光吸收層及其原料共通之較佳態樣。
作為上述包含Cl元素之量子點,例如可列舉:於金屬氧化物或金屬硫屬化物(例如,硫化物、硒化物、及碲化物等)之表面配位有Cl元素之化合物。就提高光電轉換效率之觀點而言,較佳為於金屬硫屬化物之表面配位有Cl元素之化合物。作為金屬硫屬化物,具體而言,可列舉:PbS、PbSe、PbTe、CdS、CdSe、CdTe、Sb2S3、Bi2S3、Ag2S、Ag2Se、Ag2Te、Au2S、Au2Se、Au2Te、Cu2S、Cu2Se、Cu2Te、Fe2S、Fe2Se、Fe2Te、In2S3、SnS、SnSe、SnTe、CuInS2、CuInSe2、CuInTe2、EuS、EuSe、及EuTe等。上述包含Cl元素之量子點,就光電轉換效率優異之觀點而言,較佳為包含Pb元素,更佳為包含PbS或PbSe,進而較佳為包含PbS。又,為了增大鈣鈦礦化合物與量子點之相互作用,較佳為構成鈣鈦礦化合物之金屬與構成量子點之金屬為相同金屬。
相對於構成上述包含Cl元素之量子點的金屬元素,Cl元素之原子比並無特別限制,就提高光吸收層中或分散液中之量子點之分散性的觀點,及抑制載子自鈣鈦礦化合物向量子點遷移之觀點而言,較佳為0.1以上,更佳為0.2以上,進而較佳為0.3以上,較佳為1以下,更佳為0.8以下,進而較佳為0.7以下。再者,認為於光吸收層中,相對於構成包含Cl元素之量子點的金屬元素,Cl元素之原子比係與光吸收層之原料所使用之包含Cl元素之量子點中相對於構成量子點之金屬元素的Cl元素之原子比為相同程度。
上述包含Cl元素之量子點中任意包含之其他配位基並無特別限定,就包含Cl元素之量子點之光吸收層及分散液中之分散性的觀點而言,較佳為可列舉有機配位基。作為有機配位基,例如可列舉:含羧基之化合物、含胺基之化合物、含硫醇基之化合物、及含膦基之化合物等。
作為含羧基之化合物,例如可列舉:油酸、硬脂酸、棕櫚酸、肉豆蔻酸、月桂酸、及癸酸等。
作為含胺基之化合物,例如可列舉:油胺、硬脂胺、棕櫚胺、肉豆蔻胺、月桂胺、辛基胺(caprylamine)、辛基胺(octylamine)、己基胺、及丁基胺等。
作為含硫醇基之化合物,例如可列舉:乙硫醇、乙二硫醇、苯硫酚、苯二硫酚、癸硫醇、癸二硫醇、及巰基丙酸等。
作為含膦基之化合物,例如可列舉:三辛基膦、及三丁基膦等。
關於上述有機配位基,就上述包含Cl元素之量子點之製造容易性、分散穩定性、通用性、成本等觀點而言,較佳為含羧基之化合物或含胺基之化合物,更佳為含羧基之化合物,進而較佳為長鏈脂肪酸,更進而較佳為油酸。
於包含Cl元素之量子點較佳為包含有機配位基之情形時,於製造光吸收層時用作原料之量子點中,關於相對於構成包含Cl元素之量子點之金屬元素的有機配位基之莫耳比,就於製造光吸收層時促進有機配位基與鈣鈦礦化合物之前驅物之配位基交換之觀點而言,較佳為0.01以上,更佳為0.05以上,進而較佳為0.1以上,更進而較佳為0.12以上,就提高光吸收層中或分散液中之量子點之分散性的觀點而言,較佳為0.4以下,更佳為0.3以下,進而較佳為0.2以下,更進而較佳為0.15以下。
於包含Cl元素之量子點較佳為包含有機配位基之情形時,於光吸收層中,相對於構成量子點之金屬元素,有機配位基之莫耳比並無特別限制,就提高光吸收層中之量子點之分散性並表現優異之性能的觀點而言,較佳為0.01以上,更佳為0.05以上,進而較佳為0.09以上,更進而較佳為
0.1以上,較佳為0.4以下,更佳為0.3以下,進而較佳為0.2以下,更進而較佳為0.15以下。
於包含Cl元素之量子點較佳為包含有機配位基之情形時,於光吸收層中,相對於構成上述鈣鈦礦化合物之金屬元素,上述包含Cl元素之量子點所含之有機配位基的莫耳比並無特別限制,就提高光吸收層中之量子點之分散性並表現優異之性能之觀點而言,較佳為0.001以上,更佳為0.005以上,進而較佳為0.01以上,較佳為0.1以下,更佳為0.05以下,進而較佳為0.02以下。
上述包含Cl元素之量子點之帶隙能並無特別限制,就補充上述鈣鈦礦化合物不具有之帶隙能,提高近紅外光區域之光電轉換效率的觀點而言,較佳為0.2eV以上且鈣鈦礦化合物之帶隙能以下。上述包含Cl元素之量子點可單獨使用1種,亦可將帶隙能不同之2種以上併用。再者,於使用帶隙能不同之2種以上之鈣鈦礦化合物之情形時,上述包含Cl元素之量子點之帶隙能的上述上限即「鈣鈦礦化合物之帶隙能以下之帶隙能」係指2種以上之鈣鈦礦化合物所具有之帶隙能之最大值以下之帶隙能。又,(包含Cl元素之)量子點的帶隙能如上所述,可由藉由下述實施例中所記載之方法於25℃下測得之吸收光譜而求出。
關於上述包含Cl元素之量子點之帶隙能,就提高光電轉換效率(電壓)之觀點而言,更佳為0.7eV以上,進而較佳為0.8eV以上,更進而較佳為0.9eV以上,更進而較佳為1.0eV以上,就提高光電轉換效率(電流)之觀點而言,更佳為1.6eV以下,進而較佳為1.4eV以下,更進而較佳為1.2eV以下,更進而較佳為1.1eV以下。
關於上述光吸收層中之鈣鈦礦化合物之帶隙能與上述包含Cl元素之
量子點的帶隙能之差,就提高光電轉換效率之觀點而言,較佳為0.4eV以上,更佳為0.6eV以上,進而較佳為0.8eV以上,較佳為2.0eV以下,更佳為1.5eV以下,進而較佳為1.3eV以下。
關於上述光吸收層中之包含Cl元素之量子點、及作為上述光吸收層之原料之包含Cl元素的量子點之粒徑,就提高穩定性及光電轉換效率之觀點而言,較佳為1nm以上,更佳為2nm以上,進而較佳為3nm以上,就提高成膜性及光電轉換效率之觀點而言,較佳為20nm以下,更佳為10nm以下,進而較佳為5nm以下。上述包含Cl元素之量子點的粒徑可藉由XRD(X射線繞射)之微晶直徑解析或穿透型電子顯微鏡觀察等常用方法進行測定。
關於(包含Cl元素之)量子點,例如若藉由電子顯微鏡觀察、電子束繞射、及X射線繞射圖案等而決定量子點之粒徑及種類,則亦可根據粒徑與帶隙能之相關(例如,ACS Nano2014,8,6363-6371)而算出帶隙能。
於量子點表面配位Cl元素之方法並無特別限制,例如藉由在Cl元素配位基之存在下,使與量子點之核產生結晶生長,可製備於量子點表面配位有Cl元素之量子點。具體而言,藉由使包含構成量子點之金屬元素的金屬氯化物、及氧源或硫屬元素源進行反應,可製備於量子點表面配位有Cl元素之量子點。
光吸收層之(包含Cl元素之)量子點例如可藉由元素分析、紅外(IR)光譜、拉曼光譜、核磁共振(NMR)光譜、X射線繞射圖案、吸收光譜、發光光譜、小角X射線散射、電子顯微鏡觀察、及電子束繞射等常用方法進行鑑定。
作為確認上述量子點包含Cl元素之方法,例如有使用ESCA(X射線光
電子分光)等光電子分光法並藉由量子點表面之元素分析而檢測Cl元素之方法。進而,於不包含Cl元素作為構成量子點之成分之情形時,較佳為使用XRD(X射線繞射)等繞射法而確認量子點歸屬於不含Cl元素之結晶結構。另一方面,於包含Cl元素作為構成量子點之成分之情形時,可使用ESCA等,根據Cl之鍵能波峰位移而區分結晶結構與表面之Cl元素。
作為上述鈣鈦礦化合物與上述包含Cl元素之量子點之較佳組合,就提高光電轉換效率之觀點而言,較佳為包含相同金屬元素之化合物之組合,例如可列舉:CH3NH3PbBr3與配位有Cl元素之PbS、CH3NH3PbBr3與配位有Cl元素之PbSe、CH3NH3PbI3與配位有Cl元素之PbS、CH(=NH)NH3PbBr3與配位有Cl元素之PbS、CH(=NH)NH3PbBr3與配位有Cl元素之PbSe等,更佳為CH3NH3PbBr3與配位有Cl元素之PbS的組合。
上述光吸收層中之上述鈣鈦礦化合物與上述包含Cl元素之量子點的含有比率並無特別限制,相對於上述鈣鈦礦化合物與上述包含Cl元素之量子點的合計含量,上述包含Cl元素之量子點的含有比率,就提高光電轉換效率之觀點而言,較佳為0.1質量%以上,更佳為1質量%以上,進而較佳為2質量%以上,更進而較佳為4質量%以上,就提高成膜性及光電轉換效率之觀點而言,較佳為10質量%以下,更佳為8質量%以下,進而較佳為7質量%以下。
光吸收層之厚度並無特別限制,就增大光吸收並提高光電轉換效率之觀點而言,較佳為30nm以上,更佳為50nm以上,就相同之觀點而言,較佳為1000nm以下,更佳為800nm以下,進而較佳為600nm以下,更進而較佳為500nm以下。再者,光吸收層之厚度可藉由膜剖面之電子顯微鏡觀察等測定方法進行測定。
關於光吸收層之表面平滑性,就提高電洞傳輸劑(HTM)層之強度之觀點而言,較佳為30nm以上,更佳為50nm以上,進而較佳為100nm以上,就提高光電轉換效率之觀點而言,較佳為1000nm以下,更佳為500nm以下,進而較佳為300nm以下。再者,光吸收層之表面平滑性可藉由下述實施例中所記載之方法進行測定。
關於光吸收層相對於多孔質層之被覆率,就提高光電轉換效率(電流)之觀點而言,較佳為10%以上,更佳為20%以上,進而較佳為30%以上,更進而較佳為40%以上且100%以下。再者,光吸收層相對於多孔質層之被覆率可藉由下述實施例中所記載之方法進行測定。
光吸收層中之(包含Cl元素之)量子點(QD)相對於鈣鈦礦化合物(P)的吸光度比(QD/P),就提高光電轉換效率(電壓)之觀點而言,較佳為0.3以下,更佳為0.2以下,進而較佳為0.1以下,更進而較佳為0。再者,光吸收層中之吸光度比(QD/P)係根據藉由下述實施例中記載之方法測定的光吸收層之吸收光譜,至少1種(包含Cl元素)量子點之吸光度之最大值相對於至少1種鈣鈦礦化合物之吸光度的比率。因此,至少1種(包含Cl元素之)量子點之吸光度與至少1種鈣鈦礦化合物之吸光度係分別以單獨測定該等之情形時之吸收峰位置之吸光度之形式獲得。
關於光吸收層中之發光峰能量,就提高光電轉換效率(電壓)之觀點而言,以波長800nm(能量1.55eV)之光激發光吸收層時,較佳為0.2eV以上,更佳為0.4eV以上,進而較佳為0.6eV以上,更進而較佳為0.8eV以上,就提高光電轉換效率(電流)之觀點而言,較佳為1.4eV以下,更佳為1.3eV以下,進而較佳為1.2eV以下,更進而較佳為1.1eV以下。
關於光吸收層中之發光峰能量與鈣鈦礦化合物之帶隙能的差,就提
高光電轉換效率之觀點而言,較佳為0.4eV以上,更佳為0.8eV,進而較佳為1.0eV以上,更進而較佳為1.2eV以上,較佳為3.4eV以下,更佳為2.5eV以下,進而較佳為2.0eV以下,更進而較佳為1.5eV以下。
光吸收層中之發光峰能量與(包含Cl元素之)量子點的帶隙能之差,就提高光電轉換效率之觀點而言,較佳為0.5eV以下,更佳為0.2eV以下,進而較佳為0.1eV以下。
推測(包含Cl元素之)量子點之分散液中的發光峰能量與光吸收層中之發光峰能量的差(發光峰位移)係與光吸收層中之(包含Cl元素之)量子點的粒子間距離即分散性相關,就提高光電轉換效率之觀點而言,較佳為0.5eV以下,更佳為0.2eV以下,進而較佳為0.1eV以下。為了提高光吸收層中之包含Cl元素之量子點之分散性,如上所述,較佳為將量子點之Cl元素或有機配位基之含量、粒徑等或分散液、光吸收層之製造方法控制於較佳範圍內。
再者,光吸收層中之發光峰能量如下述實施例所記載,可以藉由波長800nm(能量1.55eV)之光激發光吸收層時之發光光譜的峰波長(峰能量)之形式求出。
上述光吸收層可為含有上述鈣鈦礦化合物及上述包含Cl元素之量子點者,較佳為包含藉由上述鈣鈦礦化合物及上述包含Cl元素之量子點而形成之複合體。藉由進行複合化,不僅可使包含Cl元素之量子點均一地存在於鈣鈦礦化合物之結晶結構中,而且可使鈣鈦礦化合物及包含Cl元素之量子點間之界面結構以原子、分子級進行均一化,故而可期待進一步提高本發明之效果。為了使鈣鈦礦化合物與包含Cl元素之量子點間之界面結構以原子、分子級進行均一化而形成複合體,有效的是鈣鈦礦化合物與量子點
間之晶格匹配,例如關於Pb-Pb原子間距離,由於CH3NH3PbBr3(5.92Å)與PbS(5.97Å)近似,故而CH3NH3PbBr3與PbS之組合對於形成複合體而言較佳。再者,可藉由高分解能穿透型電子顯微鏡(HRTEM)觀察等而確認鈣鈦礦化合物與量子點之界面結構是否以原子、分子級進行均一化。
藉由上述鈣鈦礦化合物及上述包含Cl元素之量子點形成之複合體的形成方法並無特別限定,可列舉將上述鈣鈦礦化合物之前驅物與上述包含Cl元素之量子點於分散液中混合之方法等。混合方法並無限制,但就製造容易性、成本、分散液之保存穩定性、提高光電轉換效率等觀點而言,混合溫度較佳為0℃以上,更佳為10℃以上,進而較佳為20℃以上,較佳為50℃以下,更佳為40℃以下,進而較佳為30℃以下。又,就相同之觀點而言,混合時間較佳為超過0小時,更佳為0.1小時以上,較佳為72小時以下,更佳為24小時以下,進而較佳為1小時以下。又,就上述觀點而言,混合溫度較佳為0℃以上且50℃以下,更佳為10℃以上且40℃以下,進而較佳為20℃以上且30℃以下,混合時間較佳為超過0小時且72小時以下,更佳為超過0小時且24小時以下,進而較佳為0.1小時以上且1小時以下。
本發明之光電轉換元件係具有上述光吸收層者。於本發明之光電轉換元件中,上述光吸收層以外之構成並無特別限制,可應用公知之光電轉換元件之構成。又,本發明之光電轉換元件之上述光吸收層以外部分可藉由公知之方法來製造。
以下,基於圖1對本發明之光電轉換元件之構成及製造方法加以說明,但圖1僅為一例,本發明並不限定於圖1所示之態樣。
圖1係表示本發明之光電轉換元件之結構之一例的概略剖視圖。光電
轉換元件1具有依次積層有透明基板2、透明導電層3、阻擋層4、多孔質層5、光吸收層6、及電洞傳輸層7之結構。光10入射側之透明電極基板包含透明基板2與透明導電層3,透明導電層3係與成為用以與外部電路電性連接之端子的電極(負極)9接合。又,電洞傳輸層7係與成為用以與外部電路電性連接之端子的電極(正極)8接合。
作為透明基板2之材料,只要具有強度、耐久性、光穿透性即可,可使用合成樹脂及玻璃等。作為合成樹脂,例如可列舉:聚萘二甲酸乙二酯(PEN,polyethylene naphthalate)膜等熱塑性樹脂、聚對苯二甲酸乙二酯(PET,polyethylene terephthalate)、聚酯、聚碳酸酯、聚烯烴、聚醯亞胺、及氟樹脂等。就強度、耐久性、成本等觀點而言,較佳為使用玻璃基板。
作為透明導電層3之材料,例如可列舉:摻錫氧化銦(ITO)、摻氟氧化錫(FTO)、氧化錫(SnO2)、氧化銦鋅(IZO)、氧化鋅(ZnO)、及具有較高之導電性之高分子材料等。作為高分子材料,例如可列舉:聚乙炔系、聚吡咯系、聚噻吩系、聚苯乙炔系高分子材料。又,作為透明導電層3之材料,亦可使用具有較高之導電性之碳系薄膜。作為透明導電層3之形成方法,可列舉:濺鍍法、蒸鍍法、及塗佈分散物之方法等。
作為阻擋層4之材料,例如可列舉:氧化鈦、氧化鋁、氧化矽、氧化鈮、氧化鎢、氧化錫、及氧化鋅等。作為阻擋層4之形成方法,可列舉將上述材料直接濺鍍於透明導電層3之方法、及噴霧熱裂解法等。又,可列舉將於溶劑中溶解有上述材料之溶液、或溶解有作為金屬氧化物之前驅物的金屬氫氧化物之溶液塗佈於透明導電層3上,使其乾燥,視需要進行焙燒之方法。作為塗佈方法,可列舉:凹版塗佈法、棒式塗佈法、印刷法、
噴霧法、旋轉塗佈法、浸漬法、及模嘴塗佈法等。
多孔質層5具有於其表面擔載光吸收層6之功能的層。於太陽電池中,為了提高光吸收效率,較佳為擴大接受光之部分的表面積。藉由設置多孔質層5,可擴大接受光之部分的表面積。
作為多孔質層5之材料,例如可列舉:金屬氧化物、金屬硫屬化物(例如,硫化物、及硒化物等)、具有鈣鈦礦型結晶結構之化合物(其中,上述光吸收劑除外)、矽氧化物(例如,二氧化矽及沸石)、及碳奈米管(包含碳奈米線及碳奈米棒等)等。
作為金屬氧化物,例如可列舉:鈦、錫、鋅、鎢、鋯、鉿、鍶、銦、鈰、釔、鑭、釩、鈮、鋁、及鉭之氧化物等,作為金屬硫屬化物,例如可列舉:硫化鋅、硒化鋅、硫化鎘、及硒化鎘等。
作為具有鈣鈦礦型結晶結構之化合物,例如可列舉:鈦酸鍶、鈦酸鈣、鈦酸鋇、鈦酸鉛、鋯酸鋇、錫酸鋇、鋯酸鉛、鋯酸鍶、鉭酸鍶、鈮酸鉀、鐵酸鉍、鈦酸鍶鋇、鈦酸鋇鑭、鈦酸鈣、鈦酸鈉、及鈦酸鉍等。
多孔質層5之形成材料較佳為以微粒子之形式使用,更佳為以含有微粒子之分散物之形式使用。作為多孔質層5之形成方法,例如可列舉:濕式法、乾式法、其他方法(例如,Chemical Review,第110卷,6595頁(2010年刊)中記載之方法)。於該等方法中,較佳為於阻擋層4之表面塗佈分散物(漿料)後進行焙燒。可藉由焙燒使微粒子彼此密接。作為塗佈方法,可列舉:凹版塗佈法、棒式塗佈法、印刷法、噴霧法、旋轉塗佈法、浸漬法、及模嘴塗佈法等。
光吸收層6為上述本發明之光吸收層。光吸收層6之形成方法並無特別限制,例如可較佳地列舉藉由所謂濕式製程之方法,即,製備包含上述
鈣鈦礦化合物或其前驅物、及上述包含Cl元素之量子點的分散液,於多孔質層5之表面塗佈所製備之分散液,並使之乾燥。
於上述濕式製程中,包含鈣鈦礦化合物或其前驅物、及上述包含Cl元素之量子點的分散液,就成膜性、成本、保存穩定性、表現優異之性能(例如,光電轉換特性)之觀點而言,較佳為含有溶劑。作為溶劑,例如可列舉:酯類(甲酸甲酯、甲酸乙酯等)、酮類(γ-丁內酯、N-甲基-2-吡咯啶酮、丙酮、二甲基酮、二異丁基酮等)、醚類(二乙基醚、甲基-第三丁基醚、二甲氧基甲烷、1,4-二烷、四氫呋喃等)、醇類(甲醇、乙醇、2-丙醇、第三丁醇、甲氧基丙醇、二丙酮醇、環己醇、2-氟乙醇、2,2,2-三氟乙醇、2,2,3,3-四氟-1-丙醇等)、二醇醚(溶纖劑)類、醯胺系溶劑(N,N-二甲基甲醯胺、乙醯胺、N,N-二甲基乙醯胺等)、腈系溶劑(乙腈、異丁腈、丙腈、甲氧基乙腈等)、碳酸酯系(碳酸乙二酯、碳酸丙二酯等)、鹵化烴(二氯甲烷(methylene chloride)、二氯甲烷、氯仿等)、烴、及二甲基亞碸等。
關於上述分散液之溶劑,就成膜性、成本、保存穩定性、表現優異之性能(例如,光電轉換特性)之觀點而言,較佳為極性溶劑,更佳為選自酮類、醯胺系溶劑、及二甲基亞碸中之至少1種溶劑,進而較佳為醯胺系溶劑,更進而較佳為N,N-二甲基甲醯胺。
關於上述分散液中之鈣鈦礦化合物或其前驅物之金屬濃度,就成膜性、成本、保存穩定性、表現優異之性能(例如,光電轉換特性)之觀點而言,較佳為0.1mol/L以上,更佳為0.2mol/L以上,進而較佳為0.3mol/L以上,較佳為1.5mol/L以下,更佳為1.0mol/L以下,進而較佳為0.5mol/L以下。
上述分散液中之包含Cl元素之量子點的固形物成分濃度,就成膜性、成本、保存穩定性、表現優異之性能(例如,光電轉換特性)之觀點而言,較佳為1mg/mL以上,更佳為5mg/mL以上,進而較佳為10mg/mL以上,較佳為100mg/mL以下,更佳為50mg/mL以下,進而較佳為30mg/mL以下。
上述分散液之製備方法並無特別限定。再者,具體之製備方法係根據實施例之記載。
上述濕式製程中之塗佈方法並無特別限定,例如可列舉:凹版塗佈法、棒式塗佈法、印刷法、噴霧法、旋轉塗佈法、浸漬法、及模嘴塗佈法等。
作為上述濕式製程中之乾燥方法,就製造容易性、成本、表現優異之性能(例如,光電轉換特性)之觀點而言,例如可列舉:熱乾燥、氣流乾燥、真空乾燥等,較佳為熱乾燥。
又,作為形成含有上述鈣鈦礦化合物及上述包含Cl元素之量子點之光吸收層6的更詳細方法,例如較佳可列舉以下之形成方法。再者,具體之形成方法係根據實施例之記載。
首先,製備包含配位有Cl元素及其他配位基之量子點的分散液。其他配位基如上所述。
對量子點表面配位Cl元素及其他配位基之方法如上所述。
其次,製備包含鈣鈦礦化合物之前驅物之溶液。作為溶劑,例如可列舉:N,N-二甲基甲醯胺、二甲基亞碸、及γ-丁內酯等。
其後,將所製備之包含配位有Cl元素及其他配位基之量子點的分散液、與所製備之包含鈣鈦礦化合物之前驅物的溶液加以混合,將上述量子
點之配位基之一部分換為鈣鈦礦化合物之前驅物,而製備包含配位有鈣鈦礦化合物之前驅物之量子點的分散液。再者,較佳為包含配位有Cl元素及其他配位基之量子點的分散液之分散介質與包含鈣鈦礦化合物之前驅物的溶液之溶劑不混合者。藉此,可使包含脫附之配位基之溶液、與包含配位有鈣鈦礦化合物之前驅物之量子點的分散液進行相分離,可提取包含配位有鈣鈦礦化合物之前驅物的量子點之分散液。上述分散液之分散介質與上述溶液之溶劑可分別使用上述溶劑中之不會混合者。
於上述配位基交換中,Cl元素以外之配位基之配位基除去率,就提高光吸收層中或分散液中之量子點的分散性之觀點而言,較佳為10%以上,更佳為15%以上,進而較佳為20%以上。
然後,將所製備之包含配位有鈣鈦礦化合物之前驅物的量子點之分散液塗佈於多孔質層5之表面,進行乾燥,而形成光吸收層6。作為塗佈方法,例如可列舉:凹版塗佈法、棒式塗佈法、印刷法、噴霧法、旋轉塗佈法、浸漬法、及模嘴塗佈法等。
作為電洞傳輸層7之材料,例如可列舉:咔唑衍生物、聚芳基烷烴衍生物、苯二胺衍生物、芳基胺衍生物、胺基取代查耳酮衍生物、苯乙烯基蒽衍生物、茀衍生物、腙衍生物、茋衍生物、矽氮烷衍生物、芳香族三級胺化合物、苯乙烯基胺化合物、芳香族二亞甲基系化合物、卟啉系化合物、酞菁系化合物、聚噻吩衍生物、聚吡咯衍生物、及聚對苯乙炔衍生物等。作為電洞傳輸層7之形成方法,例如可列舉:塗佈法、及真空蒸鍍法等。作為塗佈方法,例如可列舉:凹版塗佈法、棒式塗佈法、印刷法、噴霧法、旋轉塗佈法、浸漬法、及模嘴塗佈法等。
作為電極(正極)8及電極(負極)9之材料,例如可列舉:鋁、金、銀、
鉑等金屬;摻錫氧化銦(ITO)、氧化銦鋅(IZO)、氧化鋅(ZnO)等導電性金屬氧化物;導電性高分子等有機系導電材料;奈米管等碳系材料。作為電極(正極)8及電極(負極)9之形成方法,例如可列舉:真空蒸鍍法、濺鍍法、及塗佈法等。
本發明之太陽電池係具有上述光電轉換元件者。於本發明之太陽電池中,上述光吸收層以外之構成並無特別限制,可應用公知之太陽電池之構成。
以下,基於實施例對本發明進行具體說明。表中只要未特別表示,則各成分之含量表示質量%。又,評價、測定方法如以下所述。再者,只要未特別表示,測定係於25℃下進行。
以疝氣燈白色光為光源(Peccell Technologies股份有限公司製造,PEC-L01),以相當於太陽光(AM1.5)之光強度(100mW/cm2),於光照射面積0.0363cm2(2mm見方)之遮罩下,使用I-V特性測量裝置(Peccell Technologies股份有限公司製造,PECK2400-N),於掃描速度0.1V/sec(0.01V step)、電壓設定後等待時間50msec、測定累計時間50msec、開始電壓-0.1V、結束電壓1.1V之條件下測定單元之I-V曲線。再者,以矽參考(BS-520,0.5714mA)進行光強度修正。由I-V曲線求出短路電流密度(mA/cm2)、開放電壓(V)、填充因數(FF,fill factor)、及轉換效率(%)。
IPCE(外部轉換效率對於入射光之波長依存性)係使用分光感度測定
裝置(分光計器股份有限公司製造,CEP-2000MLR),於光照射面積0.0363cm2之遮罩下,於300~1200nm之波長範圍進行測定。求出波長500nm及900nm之外部量子效率。
光吸收層之吸收光譜係對於塗佈電洞傳輸劑之前之試樣,使用UV-Vis分光光度計(島津製造作所股份有限公司製造,SolidSpec-3700),於掃描速度中速、樣品間距1nm、狹縫寬度20、檢測器單元積分球之條件下測定300~1600nm之範圍。利用FTO(Fluorine-doped tin oxide,摻氟氧化錫)基板(AGC Fabritech股份有限公司製造,25×25×1.8mm)進行背景測定。
PbS量子點分散液之吸收光譜係於PbS量子點粉末濃度為0.1mg/mL之己烷分散液中,使用1cm見方之石英單元,同樣地進行測定。
再者,將橫軸:波長λ、縱軸:吸光度A之吸收光譜轉換為橫軸:能量hν、縱軸:(αhν)1/2(α:吸光係數)之光譜,於吸收上升之部分擬合直線,將該直線與基準線之交點設為帶隙能。
光吸收層之發光光譜係對於塗佈電洞傳輸劑之前之試樣,使用近紅外螢光分光計(堀場製造作所股份有限公司製造,Fluorolog),於激發波長800nm(實施例1、比較例1)或激發波長815nm(實施例2、比較例2)、激發光狹縫寬度10nm、發光狹縫寬度15nm、擷取時間0.1sec、累計2次平均、打開暗補償(dark offset on)之條件下測定850~1550nm之範圍。
PbS量子點分散液之發光光譜係於PbS量子點粉末濃度為0.1mg/mL之己烷分散液中,使用1cm見方之四面透明單元,同樣地進行測定。
光吸收層之表面平滑性係對於塗佈電洞傳輸劑之前之試樣,使用奈米尺度混合顯微鏡(AFM,KEYENCE股份有限公司製造,VN-8010),於DFM-H模式、測定範圍100μm×75μm,對5個部位測定自動修正傾斜後之Ry(Rmax),求出其平均值。
光吸收層之被覆率係藉由如下方式算出:對於塗佈電洞傳輸劑之前之試樣,使用電場放射型高分解能掃描電子顯微鏡(FE-SEM,日立製造作所股份有限公司製造,S-4800)而測定光吸收層表面之SEM照片(放大倍率20000倍),針對其SEM照片,使用圖像解析軟體(Winroof)以筆工具指定光吸收層,並由光吸收層之面積相對於總面積之面積比(面積率)而算出。
光吸收層之鈣鈦礦化合物之微晶直徑係對於塗佈電洞傳輸劑之前之試樣,使用粉末X射線繞射裝置(Rigaku股份有限公司製造,MiniFlex600,光源CuKα,管電壓40kV,管電流15mA),於取樣寬度0.02°、掃描速度20°/min、索勒狹縫(入射)5.0°、發散狹縫1.250°、縱發散13.0mm、散射狹縫13.0mm、索勒狹縫(反射)5.0°、受光狹縫13.0mm之條件下測定5~60°之範圍。鈣鈦礦化合物之微晶直徑係使用解析軟體(PDXL,ver.2.6.1.2)對鈣鈦礦化合物之最強峰而算出。
PbS量子點之微晶直徑(粒徑)對於玻璃支架上之PbS量子點粉末係同樣地進行測定,使用解析軟體(PDXL,ver.2.6.1.2),於PbS之cubic(220)峰(2θ=42°)而算出。
PbS量子點粉末中之Pb濃度係將PbS量子點粉末完全溶解於硝酸/過氧
化氫混合溶液後,藉由高頻感應結合電漿發光分光(ICP)分析而定量。
PbS量子點粉末中之油酸根陰離子濃度係於重甲苯(Sigma-Aldrich Japan有限公司製造,含有99atom%D,TMS0.03 vol%)溶劑中,使用二溴甲烷(和光純藥股份有限公司製造)作為內部標準物質,藉由質子(1H)核磁共振(NMR)法進行定量。使用NMR裝置(安捷倫公司製造,VNMRS400),於共振頻率400HHz、延遲時間60秒、累計32次之條件下進行測定,由油酸根陰離子之乙烯基質子之積分值(5.5ppm vs.TMS)相對於二溴甲烷(3.9ppm vs.TMS)之積分值的比,求出PbS量子點粉末中之油酸根陰離子濃度。
PbS量子點粉末中之Cl濃度係對於玻璃基板上之PbS量子點粉末,藉由光電子分光法(ESCA)進行定量。使用ESCA裝置(ULVAC-PHI公司製造,PHI Quantera SXM),於X射線源單色化AlKα(25W,15kV)、光束徑100μm、測定範圍1mm2、行程能量112eV、步長0.2eV、帶電修正中和槍及Ar+照射、光電子提取角度45°、鍵能修正C1s(284.8eV)之條件下測定ESCA,由Pb4f、S2p、Cl2p峰求出組成。
PbS量子點之由油酸根陰離子向鈣鈦礦原料進行配位基交換時之油酸根陰離子除去率係藉由NMR法對配位基交換時之上相己烷溶液中之油酸濃度進行定量,計算己烷溶液中之油酸量相對於配位基交換前之PbS量子點之油酸根陰離子量的莫耳比。
油酸根陰離子除去率(%)=100×上相己烷溶液中之油酸量/配位基交換前之PbS量子點之油酸根陰離子量
光吸收層中之油酸根陰離子相對於構成PbS量子點之Pb元素之莫耳比係由配位基交換前之PbS量子點之油酸根陰離子量及該油酸根陰離子除去率而算出。
光吸收層中之油酸根陰離子相對於構成PbS量子點之Pb元素之莫耳比=(1-油酸根陰離子除去率/100)×(配位基交換前之PbS量子點之油酸根陰離子/Pb莫耳比)
光吸收層中之油酸根陰離子相對於構成鈣鈦礦之Pb元素之莫耳比係由配位基交換前之PbS量子點之油酸根陰離子量及該油酸根陰離子除去率、及調配組成(構成PbS量子點之Pb元素相對於構成鈣鈦礦之Pb元素的莫耳比)而算出。
光吸收層中之油酸根陰離子相對於構成鈣鈦礦之Pb元素的莫耳比=(1-油酸根陰離子除去率/100)×(配位基交換前之PbS量子點之油酸根陰離子/Pb莫耳比)×(PbS量子點之Pb莫耳/鈣鈦礦之Pb莫耳比)
將氯化鉛(Alfa Aesar公司製造,99.999%)8.34g、油胺(Acros Organics公司製造,C18 80%以上)64.8g放入300mL三口燒瓶中,於80℃下利用隔膜型真空泵對反應系內進行脫氣,並進行氮氣置換後,於140℃下攪拌30分鐘,冷卻至30℃,而製備Pb源白濁液。另一方面,將硫結晶(和光純藥股份有限公司製造,99.999%)0.321g於120℃下溶解於油胺8.10g後,冷卻至80℃,而製備S源溶液。於氮氣氛圍、強力攪拌下,使用注射器,以10秒對Pb源白濁液(30℃)注入S源溶液,而生成包含Cl元素及油胺之PbS量子點(黑濁液)。進而,攪拌40秒後,添加冷己烷200mL,
使PbS量子點之結晶生長停止。藉由離心分離(日立工機股份有限公司製造,CR21GIII,R12A轉子,4000rpm,3分鐘)除去灰色沈澱物(氯化鉛)後,對黑色上清液添加相同量之乙醇,而獲得黑色沈澱物。將減壓乾燥之黑色沈澱物4g於己烷100g中進行再分散後,藉由離心分離除去灰色沈澱物(氯化鉛)後,對黑色上清液添加混合油酸(Sigma-Aldrich Japan有限公司製造,90%)10g後,靜置18小時。進而,藉由離心分離除去灰色沈澱物(氯化鉛)後,對黑色上清液添加相同量之乙醇,而獲得黑色沈澱物。於減壓過濾(孔徑0.2μm,材質PTFE)、乙醇洗淨後,將黑色過濾物減壓乾燥,而製造配位有Cl元素及油酸根陰離子之PbS量子點粉末。
根據ESCA分析結果,Pb/S/Cl原子比=1/1.2/0.65,根據NMR及ICP分析結果,油酸根陰離子/Pb莫耳比=0.13,根據X射線繞射結果,微晶直徑為3.6nm,根據吸收光譜,吸收端波長為1240nm,根據發光光譜,發光峰波長為1260nm。
對PbS核型量子點(Sigma-Aldrich Japan有限公司製造,塗佈油酸,螢光波長1000nm,濃度10mg/mL甲苯)5g混合相同量之丙酮(和光純藥股份有限公司製造),藉由離心分離(日立工機股份有限公司製造,CR21GIII,R3S轉子,2500rpm,60分鐘)除去上清液後,將所獲得之黑色沈澱物減壓乾燥,藉此製造不含Cl元素之PbS量子點粉末。
根據ESCA分析結果,Pb/S/Cl原子比=1/1.1/0,根據NMR及ICP分析結果,油酸根陰離子/Pb莫耳比=0.62,根據X射線繞射結果,微晶直徑為3.0nm,根據吸收光譜,吸收端波長為1050nm,根據發光光譜,發光峰波長為1050nm。
依序進行如下(1)~(7)之步驟,而製作單元。
(1)FTO基板之蝕刻、洗淨
將25mm見方之附摻氟氧化錫(FTO)之玻璃基板(AGC Fabritech股份有限公司製造,25×25×1.8mm,以下稱為FTO基板)之一部分利用Zn粉末及2mol/L鹽酸水溶液進行蝕刻。利用1質量%中性洗劑、丙酮、2-丙醇(IPA)、離子交換水依序進行各10分鐘超音波洗淨。
(2)臭氧洗淨
於即將進行緻密TiO2層形成步驟之前,進行FTO基板之臭氧洗淨。將FTO面朝上,將基板放入臭氧產生裝置(Meiwafosis股份有限公司製造之臭氧清潔器,PC-450UV)中,進行30分鐘UV照射。
(3)緻密TiO2層(阻擋層)之形成
於乙醇(脫水,和光純藥工業股份有限公司製造)123.24g中溶解雙(2,4-戊烷二酮基)雙(2-丙醇)鈦(IV)(75%IPA溶液,東京化成工業股份有限公司製造)4.04g,而製備噴霧溶液。對於加熱板(450℃)上之FTO基板,自約30cm之高度以0.3MPa進行噴霧。對20cm×8行重複進行2次而噴霧約7g後,於450℃下乾燥3分鐘。進而進行該操作2次,藉此噴霧合計約21g之溶液。其後,將該FTO基板浸漬於氯化鈦(和光純藥工業股份有限公司製造)水溶液(50mM),於70℃下加熱30分鐘。水洗、乾燥後,於500℃下焙燒20分鐘(升溫15分鐘),藉此形成緻密TiO2(cTiO2)層。
(4)中孔TiO2層(多孔質層)之形成
對銳鈦礦型TiO2漿料(PST-18NR,日揮觸媒化成股份有限公司製造)0.404g添加乙醇(脫水,和光純藥工業股份有限公司製造)1.41g,進
行1小時超音波分散,而製備TiO2塗佈液。於乾燥室內,於上述cTiO2層上使用旋轉塗佈機(Mikasa股份有限公司製造,MS-100)而旋轉塗佈TiO2塗佈液(5000rpm×30sec)。於125℃之加熱板上乾燥30分鐘後,於500℃下進行30分焙燒(升溫時間60分鐘),藉此形成中孔TiO2(mTiO2)層。
(5)光吸收層之形成
光吸收層及電洞傳輸層之形成係於手套箱內進行。將溴化鉛(PbBr2,鈣鈦礦前驅物用,東京化成工業股份有限公司製造)0.114g、甲基胺氫溴酸鹽(CH3NH3Br,東京化成工業股份有限公司製造)0.035g、脫水N,N-二甲基甲醯胺(脫水DMF,和光純藥工業股份有限公司製造)1mL加以混合,於室溫下進行攪拌,而製備0.31M溴系鈣鈦礦(CH3NH3PbBr3)原料之DMF溶液(無色透明)。於室溫(25℃)、攪拌下,對配位有上述Cl元素及油酸根陰離子之PbS量子點粉末的己烷分散液(PbS量子點粉末10mg/mL己烷)2mL添加上述所製備之溴系鈣鈦礦原料的DMF溶液1mL,攪拌10分鐘後,靜置1小時。除去上相之無色透明己烷溶液後,利用孔徑0.45μm之PTFE過濾器對包含配位有下相之溴系鈣鈦礦原料的PbS量子點之分散液(PbS相對於PbS與鈣鈦礦之合計含量的質量比為6.3%)加以過濾。於上述mTiO2層上使用旋轉塗佈機(Mikasa股份有限公司製造之MS-100)而旋轉塗佈上述分散液(5000rpm×30sec)。再者,旋轉開始20秒後將作為不良溶劑之甲苯(脫水,和光純藥工業股份有限公司製造)1mL一次性滴加至旋轉中心部。旋轉塗佈後立即於100℃加熱板上使其乾燥10分鐘。利用浸潤有DMF之棉棒對與FTO之接觸部分進行擦拭後,於70℃下,使其乾燥60分鐘,而形成光吸收層。該光吸收層包含溴系鈣鈦礦化合物CH3NH3PbBr3、及包含Cl元素之PbS量子點。藉由X射線繞射圖案、吸
收光譜及電子顯微鏡觀察而確認生成鈣鈦礦化合物,又,藉由螢光光譜而確認形成量子點。
(6)電洞傳輸層之形成
混合雙(三氟甲磺醯)亞胺鋰(LiTFSI,和光純藥工業股份有限公司製造)9.1mg、[三(2-(1H-吡唑-1-基)-4-第三丁基吡啶)鈷(III)三(雙(三氟甲基磺醯(亞胺))(Co(4-tButylpyridyl-2-1H-pyrazole)3.3TFSI,和光純藥工業股份有限公司製造)8.7mg、2,2',7,7'-四[N,N-二-對甲氧基苯基胺基]-9,9'-螺二茀(Spiro-OMeTAD,和光純藥工業股份有限公司製造)72.3mg、氯苯(Nacalai Tesque股份有限公司製造)1mL、三丁基膦(TBP,Sigma-Aldrich製造)28.8μL,進行室溫攪拌,而製備電洞傳輸劑(HTM)溶液(黑紫色透明)。即將使用前,利用孔徑0.45μm之PTFE過濾器對HTM溶液進行過濾。於上述光吸收層上使用旋轉塗佈機(Mikasa股份有限公司,MS-100)而旋轉塗佈HTM溶液(4000rpm×30sec)。旋轉塗佈後立即於70℃加熱板上乾燥30分鐘。乾燥後,利用浸潤有氯苯之棉棒對與FTO之接觸部分進行擦拭後,利用浸潤有DMF之棉棒對整個基板背面進行擦拭,進而於70℃之加熱板上使其乾燥數分鐘,而形成電洞傳輸層。
(7)金電極之蒸鍍
使用真空蒸鍍裝置(ULVAC機工股份有限公司製造之VTR-060M/ERH),於真空下(4~5×10-3Pa),於上述電洞傳輸層上蒸鍍(蒸鍍速度8~9Å/sec)金100nm,而形成金電極。
於形成實施例1之(5)光吸收層時,除使用碘化鉛(PbI2,鈣鈦礦前驅物用,東京化成工業股份有限公司製造)0.143g代替溴化鉛,使用甲基胺
碘化氫酸鹽(CH3NH3I,東京化成工業股份有限公司製造)0.049g代替甲基胺氫溴酸鹽以外,以與實施例1相同之方式形成光吸收層,而製作單元。
於形成實施例1之(5)光吸收層時,除使用不含Cl元素之PbS量子點代替上述包含Cl元素之PbS量子點以外,以與實施例1相同之方式形成光吸收層,而製作單元。
於形成實施例2之(5)光吸收層時,除使用不含Cl元素之PbS量子點代替上述包含Cl元素之PbS量子點以外,以與實施例2相同之方式形成光吸收層,而製作單元。
本發明之光吸收層及光電轉換元件可適宜地用作下一代太陽電池之構成構件。
1‧‧‧光電轉換元件
2‧‧‧透明基板
3‧‧‧透明導電層
4‧‧‧阻擋層
5‧‧‧多孔質層
6‧‧‧光吸收層
7‧‧‧電洞傳輸層
8‧‧‧電極(正極)
9‧‧‧電極(負極)
10‧‧‧光
Claims (18)
- 一種光吸收層,其含有鈣鈦礦化合物、與包含Cl元素之量子點,上述鈣鈦礦化合物為選自下述通式(1)所表示之化合物及下述通式(2)所表示之化合物中之1種以上,上述包含Cl元素之量子點包含金屬氧化物或金屬硫屬化物,上述包含Cl元素之量子點中,相對於構成量子點之金屬元素,Cl元素之原子比為0.1以上且1以下,RMX3 (1)(式中,R為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子)R1R2R3 n-1MnX3n+1 (2)(式中,R1、R2、及R3分別獨立為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子,n為1以上且10以下之整數)。
- 如請求項1之光吸收層,其中上述X為氟陰離子、氯陰離子、溴陰離子、或碘陰離子。
- 如請求項1或2之光吸收層,其中上述R為選自烷基銨離子及甲脒鎓離子中之1種以上。
- 如請求項1或2之光吸收層,其中上述R1、R2、及R3為選自烷基銨離子及甲脒鎓離子中之1種以上。
- 如請求項1或2之光吸收層,其中上述M為Pb2+、Sn2+、或Ge2+。
- 如請求項1或2之光吸收層,其中上述鈣鈦礦化合物之帶隙能為1.5eV以上且4.0eV以下。
- 如請求項1或2之光吸收層,其中上述包含Cl元素之量子點之帶隙能為0.2eV以上且上述鈣鈦礦化合物之帶隙能以下。
- 如請求項1或2之光吸收層,其中上述包含Cl元素之量子點為於金屬氧化物或金屬硫屬化物之表面至少配位有Cl元素之化合物。
- 如請求項1或2之光吸收層,其中上述包含Cl元素之量子點包含Pb元素。
- 如請求項1或2之光吸收層,其中相對於上述鈣鈦礦化合物及上述包含Cl元素之量子點的合計含量,上述包含Cl元素之量子點之含有比率為0.1質量%以上且10質量%以下。
- 一種分散液,其含有鈣鈦礦化合物或其前驅物、與包含Cl元素之量子點,上述鈣鈦礦化合物為選自下述通式(1)所表示之化合物及下述通式(2)所表示之化合物中之1種以上,上述包含Cl元素之量子點包含金屬氧化物或金屬硫屬化物, 上述包含Cl元素之量子點中,相對於構成量子點之金屬元素,Cl元素之原子比為0.1以上且1以下,RMX3 (1)(式中,R為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子)R1R2R3 n-1MnX3n+1 (2)(式中,R1、R2、及R3分別獨立為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子,n為1以上且10以下之整數)。
- 如請求項11之分散液,其中上述分散液含有溶劑。
- 如請求項11或12之分散液,其中上述分散液中之鈣鈦礦化合物或其前驅物之金屬濃度為0.1mol/L以上且1.5mol/L以下。
- 如請求項11或12之分散液,其中上述分散液中之包含Cl元素之量子點的固形物成分濃度為1mg/mL以上且100mg/mL以下。
- 一種光吸收層之製造方法,其係製造含有鈣鈦礦化合物、與包含Cl元素之量子點的光吸收層之方法,並且包括:將鈣鈦礦化合物或其前驅物、與包含Cl元素之量子點加以混合之步驟,上述鈣鈦礦化合物為選自下述通式(1)所表示之化合物及下述通式(2)所表示之化合物中之1種以上,上述包含Cl元素之量子點包含金屬氧化物或金屬硫屬化物,上述包含Cl元素之量子點中,相對於構成量子點之金屬元素,Cl元 素之原子比為0.1以上且1以下,RMX3 (1)(式中,R為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子)R1R2R3 n-1MnX3n+1 (2)(式中,R1、R2、及R3分別獨立為1價陽離子,M為2價金屬陽離子,X為鹵素陰離子,n為1以上且10以下之整數)。
- 如請求項15之光吸收層之製造方法,其中上述混合之步驟係濕式製程之步驟。
- 一種光電轉換元件,其具有如請求項1至10中任一項之光吸收層。
- 一種太陽電池,其具有如請求項17之光電轉換元件。
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