TW202322375A - 感光元件基板 - Google Patents

感光元件基板 Download PDF

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TW202322375A
TW202322375A TW110144170A TW110144170A TW202322375A TW 202322375 A TW202322375 A TW 202322375A TW 110144170 A TW110144170 A TW 110144170A TW 110144170 A TW110144170 A TW 110144170A TW 202322375 A TW202322375 A TW 202322375A
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electrode
photosensitive element
substrate
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photoelectric conversion
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蔡佳修
張家銘
陳瑞沛
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友達光電股份有限公司
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Priority to CN202210361855.1A priority patent/CN114709232A/zh
Priority to US17/898,404 priority patent/US20230170432A1/en
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Abstract

一種感光元件基板包括基板、主動元件以及感光元件。主動元件和感光元件設置在基板上。主動元件具有半導體圖案和閘極。半導體圖案設置在基板與閘極之間。感光元件電性連接主動元件。感光元件具有光電轉換層以及設置在光電轉換層的相對兩側的第一電極和第二電極。第一電極位在光電轉換層與半導體圖案之間,且第一電極的材料包括金屬氧化物。

Description

感光元件基板
本發明是有關於一種感測基板,且特別是有關於一種感光元件基板。
光感測器的應用非常廣泛。較常見的有數位相機或攝影機所使用的影像感測器,例如互補式金屬氧化物半導體(Complementary Metal-Oxide-Semiconductor,CMOS)影像感測器或電荷耦合元件(Charge-coupled Device,CCD)。除此之外,用於安檢、工業檢測或醫療診察的非可見光(例如X射線)感測器,因其高附加價值而成為相關製造商的重點開發項目。
一般來說,用於醫療檢測或手術用的X射線感測器須具備較高的感測頻率才能讓醫療人員從中取得病患體內的即時狀態,來增加檢測的準確率和手術的成功率。因此,這類感測器大都使用具有高電子遷移率(high electron mobility)的薄膜電晶體來作為開關元件。其中,金屬氧化物半導體電晶體因具有較低的漏電流和雜訊而受到青睞。然而,在製程中,金屬氧化物半導體層的操作電性,例如電流-電壓曲線(I-V curve),容易受到後續製程的反應氣體影響而改變,造成後續形成的電晶體的電性不良。
本發明提供一種具有高感測頻率的感光元件基板,其操作電性和穩定性都較佳。
本發明的感光元件基板,包括基板、主動元件以及感光元件。主動元件和感光元件設置在基板上。主動元件具有半導體圖案和閘極。半導體圖案設置在基板與閘極之間。感光元件電性連接主動元件。感光元件具有光電轉換層以及設置在光電轉換層的相對兩側的第一電極和第二電極。第一電極位在光電轉換層與半導體圖案之間,且第一電極的材料包括金屬氧化物。
基於上述,在本發明的一實施例的感光元件基板中,感光元件在較靠近主動元件一側的第一電極可採用金屬氧化物來製作,使其可有效阻擋光電轉換層的製程氣體滲透至主動元件的半導體圖案而影響先形成的主動元件的操作電性和穩定性。
本文使用的「約」、「近似」、「本質上」、或「實質上」包括所述值和在本領域普通技術人員確定的特定值的可接受的偏差範圍內的平均值,考慮到所討論的測量和與測量相關的誤差的特定數量(即,測量系統的限制)。例如,「約」可以表示在所述值的一個或多個標準偏差內,或例如±30%、±20%、±15%、±10%、±5%內。再者,本文使用的「約」、「近似」、「本質上」、或「實質上」可依量測性質、切割性質或其它性質,來選擇較可接受的偏差範圍或標準偏差,而可不用一個標準偏差適用全部性質。
在附圖中,為了清楚起見,放大了層、膜、面板、區域等的厚度。應當理解,當諸如層、膜、區域或基板的元件被稱為在另一元件「上」或「連接到」另一元件時,其可以直接在另一元件上或與另一元件連接,或者中間元件可以也存在。相反,當元件被稱為「直接在另一元件上」或「直接連接到」另一元件時,不存在中間元件。如本文所使用的,「連接」可以指物理及/或電性連接。再者,「電性連接」可為二元件間存在其它元件。
現將詳細地參考本發明的示範性實施方式,示範性實施方式的實例說明於所附圖式中。只要有可能,相同元件符號在圖式和描述中用來表示相同或相似部分。
圖1是依照本發明的第一實施例的感光元件基板的剖視示意圖。請參照圖1,感光元件基板10包括基板100、主動元件T和感光元件PD。主動元件T和感光元件PD設置在基板100上,且彼此電性連接。需說明的是,雖然圖式未繪示,但本實施例的感光元件PD和主動元件T的數量可以分別是多個,且陣列排列於基板100上。
在本實施例中,形成主動元件T的方法可包括以下步驟:在基板100上依序形成半導體圖案SC、閘絕緣層110、閘極GE、層間絕緣層120、源極SE和汲極DE,其中半導體圖案SC具有通道區CH、源極區SR和汲極區DR,且源極SE和汲極DE貫穿層間絕緣層120以分別電性連接半導體圖案SC的源極區SR和汲極區DR。在本實施例中,主動元件T的閘極GE可選擇性地配置在半導體圖案SC的上方(即半導體圖案SC設置在閘極GE與基板100之間),以形成頂部閘極型薄膜電晶體(top-gate TFT),但本發明不以此為限。根據其他的實施例,主動元件的閘極GE也可配置在半導體圖案SC的下方,以形成底部閘極型薄膜電晶體(bottom-gate TFT)。
半導體圖案SC的材料例如是銦鎵鋅氧化物(IGZO)、或其他具有高電子遷移率(high electron mobility)的金屬氧化物。也就是說,主動元件T例如是金屬氧化物薄膜電晶體(metal-oxide thin film transistor)。需說明的是,閘極GE、源極SE、汲極DE、閘絕緣層110和層間絕緣層120分別可由任何所屬技術領域中具有通常知識者所周知的用於顯示面板的任一閘極、任一源極、任一汲極、任一層間絕緣層及任一閘絕緣層來實現,且閘極GE、源極SE、汲極DE、閘絕緣層110和層間絕緣層120分別可藉由任何所屬技術領域中具有通常知識者所周知的任一方法來形成,故於此不加以贅述。
由於本實施例的主動元件T是採用具有高電子遷移率的半導體材料,感光元件基板10可應用在醫療用的X射線(x-ray)感測面板上。舉例來說,X射線感測面板可包括感光元件基板10和波長轉換層,波長轉換層設置在感光元件基板10的收光側,並且重疊於多個感光元件PD。此處的波長轉換層的材料例如是碘化銫(Cesium Iodide,CsI),其在吸收入射的X射線後會發出可見光(例如綠光),而感光元件PD適於接收該可見光並產生相對應的電訊號。
進一步而言,形成感光元件PD的方法可包括以下步驟:在主動元件T上依序形成絕緣層130、第一電極E1、光電轉換層PCL和第二電極E2。在本實施例中,絕緣層130的材料可選自無機材料(例如氧化矽、氮化矽、氮氧化矽、其它合適的材料或上述至少二種材料的堆疊層)。第一電極E1的材料包括金屬氧化物,例如是銦鎵鋅氧化物(IGZO)。第二電極E2的材料包括透明導電材料,例如是銦錫氧化物(ITO)或銦鋅氧化物(IZO)。
光電轉換層PCL例如是由P型摻雜層、本質層及N型摻雜層堆疊形成的PIN接面結構,但不以此為限。在其他實施例中,光電轉換層PCL也可以是由P型摻雜層及N型摻雜層堆疊形成的PN接面結構,或者是,由PN接面結構與PIN接面結構重複排列的串疊結構。
特別說明的是,在本實施例中,光電轉換層PCL的材料例如是氫化非晶矽(a-Si:H)。由於氫化非晶矽的沉積製程中會使用矽甲烷(SiH 4)和氫氣(H 2)這類容易滲透其他膜層的反應氣體,且在後續的第二電極E2的退火製程中,氫化非晶矽材料層中的氫原子也容易擴散至其他的膜層,例如先形成的半導體圖案SC,造成先形成的主動元件T的操作電性受到影響。
為了有效阻擋氫氣的滲透或氫原子的擴散,位在光電轉換層PCL與半導體圖案SC之間的第一電極E1的材料可選用金屬氧化物(例如銦鎵鋅氧化物)來製作。特別說明的是,銦鎵鋅氧化物在吸收氫元素後,其導電性會增加。因此,選用銦鎵鋅氧化物來製作第一電極E1,除了能有效阻擋光電轉換層PCL的氫元素擴散至半導體圖案SC,還能滿足第一電極E1的導電性需求。
另一方面,設置在半導體圖案SC上方的閘極GE的材料也可選用銦鎵鋅氧化物來製作。因此,可進一步阻擋氫氣在光電轉換層PCL的沉積製程中滲透至半導體圖案SC而影響主動元件T的操作電性。
在本實施例中,感光元件基板10還可選擇性地包括反射式電極RE,設置在第一電極E1與主動元件T之間,並且沿著垂直於基板100的方向重疊於光電轉換層PCL。反射式電極RE電性連接於第一電極E1與主動元件T的源極SE之間。舉例來說,反射式電極RE、源極SE和汲極DE可屬於同一膜層,但不以此為限。反射式電極RE的材料例如是金屬、合金、金屬材料的氮化物、金屬材料的氧化物、金屬材料的氮氧化物、或其他具有高反射率的導電材料、或是金屬材料與其他導電材料的堆疊層。
詳細而言,絕緣層130具有重疊於反射式電極RE的開口130a,感光元件PD的第一電極E1設置在此開口130a內,並且與反射式電極RE直接接觸。特別注意的是,第一電極E1與反射式電極RE的接觸面積大於第一電極E1與光電轉換層PCL的接觸面積。據此,除了可增加感光元件PD的光電轉換效率外,還能提升感光元件PD的第一電極E1與主動元件T的源極SE之間的導電性。
進一步而言,感光元件基板10更包括絕緣層140、平坦層150、絕緣層161、絕緣層162和金屬導電層。絕緣層140和平坦層150依序覆蓋感光元件PD和絕緣層130,且具有重疊於感光元件PD的開口OP。絕緣層161、金屬導電層和絕緣層162依序設置在平坦層150上。在本實施例中,金屬導電層可包括導電圖案171和導電圖案173。導電圖案171延伸入平坦層150和絕緣層140的開口OP,並且與感光元件PD的第二電極E2電性連接。導電圖案173貫穿絕緣層161、平坦層150、絕緣層140和絕緣層130以電性連接主動元件T的汲極DE。
舉例來說,導電圖案171和導電圖案173可電性連接不同的訊號線以分別傳輸感光元件PD所需的偏壓訊號和感光元件PD接收光線後所產生的電訊號,但不以此為限。需說明的是,本發明並不加以侷限金屬導電層與絕緣層的數量。在其他實施例中,金屬導電層與絕緣層的數量當可根據實際的電路設計需求而調整。
在本實施例中,絕緣層140、平坦層150、絕緣層161、絕緣層162的材料可選自無機材料(例如氧化矽、氮化矽、氮氧化矽、其它合適的材料或上述至少二種材料的堆疊層)。平坦層150的材料可選自氧化矽、氮化矽、氧化鋁、氮氧化矽、其它合適的材料。有機材料層的材料可選自聚乙烯=咯烷酮(poly(vinyl pyrrolidone),PVP)、聚乙烯醇(polyvinyl alcohol,PVA)、聚甲基丙烯酸甲酯(poly(methyl methacrylate),PMMA)、乙烯四氟乙烯共聚物(ethylene-tetrafluoroethylene,ETFE)、氟化乙烯丙烯共聚物(fluorinated ethylene propylene,FEP)、聚偏二氟乙烯共聚物(poly(vinylidene fluoride),PVDF)、聚氟乙烯共聚物(polyvinyl fluoride,PVF)、乙烯-氯代三氟乙烯共聚物(ethylene chlorotrifluoroethylene,ECTFE)、聚四氟乙烯(polytetrafluoroethylene,PTFE)、過氟烷氧基化物(PFA,perfluoro(alkoxy alkane))或其他氟系材料。
以下將列舉另一些實施例以詳細說明本揭露,其中相同的構件將標示相同的符號,並且省略相同技術內容的說明,省略部分請參考前述實施例,以下不再贅述。
圖2是依照本發明的第二實施例的感光元件基板的剖視示意圖。請參照圖2,本實施例的感光元件基板11與圖1的感光元件基板10的差異在於:感光元件的第一電極的配置方式不同。具體而言,感光元件基板11的絕緣層130A不具有圖1的開口130a,而是具有不重疊於光電轉換層PCL的一接觸孔TH。此接觸孔TH位在光電轉換層PCL與主動元件T之間。在本實施例中,感光元件PD-A的第一電極E1A是經由上述的接觸孔TH與反射式電極RE(或源極SE)電性連接。
由於本實施例的第一電極E1A的材料選用及其所產生的技術效果相似於圖1的第一電極E1,詳細的說明請參見前述實施例的相關段落,於此便不再贅述。
圖3是依照本發明的第三實施例的感光元件基板的剖視示意圖。請參照圖3,本實施例的感光元件基板12與圖2的感光元件基板11的主要差異在於:感光元件基板12還可選擇性地包括犧牲圖案SP。在本實施例中,犧牲圖案SP沿著垂直於基板100的方向重疊於主動元件T的半導體圖案SC和閘極GE。半導體圖案SC和閘極GE位在基板100與犧牲圖案SP之間。
特別注意的是,犧牲圖案SP與感光元件PD-B的第一電極E1B可以是同一膜層。也就是說,犧牲圖案SP與第一電極E1B的材料可選擇性地相同。例如:犧牲圖案SP也可同第一電極E1B選用銦鎵鋅氧化物來製作。因此,可進一步阻擋氫氣在光電轉換層PCL的沉積製程中滲透至半導體圖案SC而影響主動元件T的操作電性。
另一方面,犧牲圖案SP與第一電極E1B彼此電性獨立。例如:犧牲圖案SP可具有一浮置(floating)電位。為了避免第一電極E1B與犧牲圖案SP電性短路,本實施例的絕緣層130B的接觸孔TH”可改設置在感光元件PD-B遠離犧牲圖案SP的一側並且不重疊於光電轉換層PCL的位置,但不以此為限。
圖4是依照本發明的第四實施例的感光元件基板的剖視示意圖。請參照圖4,本實施例的感光元件基板13與圖2的感光元件基板11的主要差異在於:感光元件基板13的感光元件PD-C的第一電極E1C為金屬氧化物導電圖案E1a和金屬導電圖案E1b的堆疊結構,且金屬氧化物導電圖案E1a設置在金屬導電圖案E1b與光電轉換層PCL之間。相似於圖2的第一電極E1A,本實施例的第一電極E1C可經由絕緣層130C的開口130b與主動元件T的源極SE電性連接。
舉例來說,金屬氧化物導電圖案E1a和金屬導電圖案E1b可分別選用銦鎵鋅氧化物和鉬金屬來製作。較佳地,金屬氧化物導電圖案E1a和金屬導電圖案E1b各自的膜厚可大於30nm。由於金屬導電圖案E1b是選用鉬金屬而非合金來製作,除了可增加第一電極E1C整體的導電性外,還能進一步阻擋光電轉換層PCL的氫元素擴散至半導體圖案SC。
此外,由於本實施例的金屬導電圖案E1b具有光反射的特性,感光元件基板13可省去圖2的反射式電極RE的設置。在本實施例中,金屬氧化物導電圖案E1a與金屬導電圖案E1b可在同一圖案化製程(例如微影蝕刻製程)中形成。亦即,金屬氧化物導電圖案E1a與金屬導電圖案E1b可使用同一光罩來進行曝光顯影。據此,本實施例的感光元件基板13可具有較簡化的生產製程。
綜上所述,在本發明的一實施例的感光元件基板中,感光元件在較靠近主動元件一側的第一電極可採用金屬氧化物來製作,使其可有效阻擋光電轉換層的製程氣體滲透至主動元件的半導體圖案而影響先形成的主動元件的操作電性和穩定性。
10、11、12、13:感光元件基板 100:基板 110:閘絕緣層 120:層間絕緣層 130、130A、130B、130C、140、161、162:絕緣層 130a、130b、OP:開口 150:平坦層 171、173:導電圖案 CH:通道區 DE:汲極 DR:汲極區 E1、E1A、E1B、E1C:第一電極 E1a:金屬氧化物導電圖案 E1b:金屬導電圖案 E2:第二電極 GE:閘極 PCL:光電轉換層 PD、PD-A、PD-B、PD-C:感光元件 RE:反射式電極 SC:半導體圖案 SE:源極 SP:犧牲圖案 SR:源極區 T:主動元件 TH、TH”:接觸孔
圖1是依照本發明的第一實施例的感光元件基板的剖視示意圖。 圖2是依照本發明的第二實施例的感光元件基板的剖視示意圖。 圖3是依照本發明的第三實施例的感光元件基板的剖視示意圖。 圖4是依照本發明的第四實施例的感光元件基板的剖視示意圖。
10:感光元件基板
100:基板
110:閘絕緣層
120:層間絕緣層
130、140、161、162:絕緣層
130a、OP:開口
150:平坦層
171、173:導電圖案
CH:通道區
DE:汲極
DR:汲極區
E1:第一電極
E2:第二電極
GE:閘極
PCL:光電轉換層
PD:感光元件
RE:反射式電極
SC:半導體圖案
SE:源極
SR:源極區
T:主動元件

Claims (13)

  1. 一種感光元件基板,包括: 一基板; 一主動元件,設置在該基板上,且具有一半導體圖案和一閘極,該半導體圖案設置在該基板與該閘極之間;以及 一感光元件,設置在該基板上,且電性連接該主動元件,該感光元件具有一光電轉換層以及設置在該光電轉換層的相對兩側的一第一電極和一第二電極,其中該第一電極位在該光電轉換層與該半導體圖案之間,且該第一電極的材料包括金屬氧化物。
  2. 如請求項1所述的感光元件基板,其中該半導體圖案的材料包括銦鎵鋅氧化物。
  3. 如請求項1所述的感光元件基板,其中該第一電極的材料包括銦鎵鋅氧化物。
  4. 如請求項1所述的感光元件基板,其中該光電轉換層的材料包括氫化非晶矽(a-Si:H)。
  5. 如請求項1所述的感光元件基板,其中該閘極的材料包括銦鎵鋅氧化物。
  6. 如請求項1所述的感光元件基板,更包括: 一反射式電極,設置在該第一電極與該主動元件之間,且重疊於該光電轉換層,該反射式電極電性連接於該第一電極與該主動元件的一源極之間。
  7. 如請求項6所述的感光元件基板,其中該第一電極與該反射式電極的接觸面積大於該第一電極與該光電轉換層的接觸面積。
  8. 如請求項1所述的感光元件基板,更包括: 一犧牲圖案,重疊設置於該主動元件的該閘極和該半導體圖案,其中該半導體圖案和該閘極位在該基板與該犧牲圖案之間,且該犧牲圖案的材料包括金屬氧化物。
  9. 如請求項8所述的感光元件基板,其中該犧牲圖案的材料包括銦鎵鋅氧化物。
  10. 如請求項8所述的感光元件基板,其中該犧牲圖案與該第一電極為同一膜層,且彼此電性獨立。
  11. 如請求項8所述的感光元件基板,其中該犧牲圖案具有一浮置電位。
  12. 如請求項1所述的感光元件基板,其中該第一電極為一金屬導電圖案和一金屬氧化物導電圖案的堆疊結構,該金屬氧化物導電圖案設置在該金屬導電圖案與該光電轉換層之間。
  13. 如請求項12所述的感光元件基板,其中該金屬導電圖案的材料為鉬金屬。
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