CN110372524B - 一种以联二萘胺为母核的三苯胺类有机空穴传输材料及其的合成及其用途 - Google Patents

一种以联二萘胺为母核的三苯胺类有机空穴传输材料及其的合成及其用途 Download PDF

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CN110372524B
CN110372524B CN201910560414.2A CN201910560414A CN110372524B CN 110372524 B CN110372524 B CN 110372524B CN 201910560414 A CN201910560414 A CN 201910560414A CN 110372524 B CN110372524 B CN 110372524B
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路雨
宗雪平
崔天强
盖鸿玮
薛松
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Abstract

本发明涉及一种以联二萘胺为母核的三苯胺类有机空穴传输材料及其的合成及其用途。该类化合物以三芳胺作为给电子单元,以具有一定螺旋结构的联二萘胺为母核,其具有式I所示结构
Figure DDA0002108095700000011
式(I)中:R1为C1~C12烃基、C1~C12烷氧基。R2和R3为含N、S或O取代的C4~C20的芳环基,或为C1~C20的烃基,或为氢原子。该类化合物可以作为钙钛矿太阳能电池中的空穴传输材料,具有传输空穴能力。该类分子具有C2对称轴,所制备的空穴薄膜形态稳定性良好,可以有效减少由于薄膜缺陷导致的电荷复合,能够产生分子内空穴的有效转移。具有易于合成,工艺简单,光电性能突出,以及空穴分子的空穴迁移率高、光热稳定性好的特点。

Description

一种以联二萘胺为母核的三苯胺类有机空穴传输材料及其的 合成及其用途
技术领域
本发明涉及一种三苯胺类化合物及其用途,具体地说,涉及一种以联二萘胺为母核的三苯胺类有机小分子的合成及其用途。
背景技术
在能源危机和环境污染的背景下,太阳能作为一种清洁可再生能源正逐步走入人类生活。其中,太阳能电池是利用太阳能的主要技术之一。钙钛矿太阳能电池(JACS,2009,131(17):6050.)。自问世以来,便以其高效、低成本、低能耗、易于制备等优点,显示出强大的商业应用前景。
目前,钙钛矿太阳能电池按结构分类,主要分为正置钙钛矿太阳能电池和反置钙钛矿太阳能电池,其中后者的电子传输层和空穴传输层均采用有机化合物,便于溶液加工,避免高温操作,同时可以实现柔性光伏器件的制备。截止至今,应用到反置钙钛矿电池的两种有机空穴传输材料(亦可称为固态电解质)分别为PEDOT:PSS或者PTAA。PEDOT:PSS呈现弱酸性,会腐蚀器件,分解钙钛矿材料,会缩短电池的使用寿命。此外,PEDOT:PSS的HOMO能级偏高,电池的开路电压比较低,从而导致电池的光电转换效率偏低(Acc.Chem.Res.49(1)(2016)155.)。PTAA提纯复杂,成本较高。因此,近年来,合成用于可替代PEDOT:PSS或者PTAA的高效有机空穴传输材料成为该领域的研究热点。
在已开发的有机空穴传输材料中,三苯胺衍生物由于具有良好的空穴传输性能和强给电子能力,成为一类性能优良的有机空穴传输材料。如,以六元环为母核的三苯胺类衍生物(Adv.Funct.Mater.2017,27(31),1702613)具有良好的光电转换性能。联二萘胺具有C2对称轴的结构,该类结构的分子所制备的空穴薄膜形态稳定性良好(Angew.Chem.Int.Ed.2018,57,12529.),可以有效减少由于薄膜缺陷导致的电荷复合,以保证更加有效的空穴迁移性能,同时可以很容易的引入各类侧链基团,可有效抑制分子聚集并减少电子复合,是优良的光电材料。以联二萘胺环为母核的三苯胺类有机空穴传输材料同时具备三苯胺和联二萘胺的优点,可提高空穴分子的空穴迁移率,并增强空穴薄膜的形态稳定性。然而,以联二萘胺为母核的三苯胺类有机小分子应用于钙钛矿太阳能电池的研究很少。
综上,设计和制备以联二萘胺为母核的三苯胺类有机小分子,使其具有良好的薄膜形态,提高光电转换效率,成为本发明需要解决的技术问题。
发明内容
本发明的目的之一在于,提供新一类以联二萘胺为母核的三苯胺类有机小分子空穴传输材料及其制备方法;
本发明的目的之二在于,提供上述以联二萘胺为母核的三苯胺类有机小分子的用途。
本发明所提供的新型有机染料敏化剂具有如下的结构通式:
Figure BDA0002108095680000021
式(I)中:R1为C1~C12烃基、C1~C12烷氧基。R2和R3为含N、S或O取代的C4~C20的芳环基,或为C1~C20的烃基,或为氢原子。
在本发明的一个优选技术方案中,R1为C1~C6烃基。
在本发明的另一个优选技术方案中,R2和R3为C1~C6的烃基,或甲氧基取代的芳基,或氢原子。式II、或式III、或式IV所示基团为最佳R2和R3中的一种。
Figure BDA0002108095680000031
制备本发明所述以联二萘胺为母核的三苯胺类有机小分子空穴传输材料的部分合成路线如下所示:
Figure BDA0002108095680000032
上述合成路线中R2和R3含义与前文所述相同。
即:以溴代联二萘胺V为原料(合成参见ChemistrySelect,2017,2(16)4392-4397),与三苯胺硼酯进行Suzuki偶联反应得到本发明所述以联二萘胺为母核的三苯胺类有机小分子空穴传输材料。
上述的以联二萘胺为母核的三苯胺类有机小分子的制备方法,其特征在于经过下述步骤:
在100mL的两口瓶中,加入化合物V、三苯胺硼酸酯,以四氢呋喃为溶剂,在四(三苯基膦)钯催化作用下,氮气保护条件下搅拌5分钟。随后,将配好的0.5mmol/ml碳酸钠溶液加入混合液中。所得溶液在氮气保护下回流搅拌20小时。冷却,减压蒸馏除掉溶剂。将粗产品萃取、分液和干燥,最后经柱层析分离制得。
本发明所述的以联二萘胺为母核的三苯胺类有机小分子可作为钙钛矿太阳能电池的空穴传输材料(固态电解质)。所述的钙钛矿太阳能电池包括ITO导电玻璃、空穴传输层、钙钛矿吸光层、电子传输层和银电极。其中,银电极经过减压蒸镀方法获得。电子传输层制备方法为:以无水氯苯为溶剂,配制20mg/ml的PCBM溶液,经旋涂方法制备电子传输层。
上述的应用中钛矿吸光层的制备方法经过下述步骤:
在DMF:DMSO(9:1,vol)的混合溶剂中,加入461mg的碘化铅和159mg的碘甲胺,该混合体系在50℃加热条件下搅拌1小时。所得澄清溶液经旋涂方法制备钙钛矿前驱液层,再经100℃加热10分钟获得钙钛矿吸光层。
该电池装置的结构包括导电玻璃;二氧化钛膜;钙钛矿吸光层;空穴传输层;金属对电极。该电池有效光照面积为:0.09cm2;测试光源:AM1.5solar simulator-Oriel91160-1000(300W);数据采集:Keithley 2400数字源表。
本发明达到的有益效果是:
1、本发明提供的以联二萘胺为母核的三苯胺类有机小分子具有C2对称轴的结构,所制备的空穴薄膜形态稳定性良好,可以有效减少由于薄膜缺陷导致的电荷复合,能够产生分子内空穴的有效转移。三苯胺的非平面结构和联二萘胺的四个侧链可抑制染料分子的聚集,减少电子的复合,提高了空穴分子的空穴迁移率;另外,萘环的刚性结构提高了分子的光热稳定性。
2、本发明所述的以联二萘胺为母核的三苯胺类有机小分子空穴传输材料制备工艺简单,产率较高,易于纯化。该类有机空穴传输材料可通过分子设计进行改性,获得性能优异的光电材料。
3、本发明所述的以联二萘胺为母核的三苯胺类有机小分子作为空穴传输材料应用于钙钛矿太阳能电池中,具有良好的光电转换性能。
附图说明
图1为实施例1-4制备的以联二萘胺为母核的三苯胺类有机小分子溶解于二氯甲烷中的循环伏安曲线。
图2为实施例5制作的钙钛矿太阳能电池结构示意图。
图3为实施例1-4制备的以联二萘胺为母核的三苯胺类有机小分子作为空穴传输材料的钙钛矿太阳能电池的I-V曲线。
具体实施方式
下面通过实施例对本发明作进一步阐述,其目的在于更好地理解本发明的内容。因此,所举之例不限制本发明的保护范围。
实施例1:
以联二萘胺为母核的三苯胺类有机小分子3的合成路线:
Figure BDA0002108095680000051
在100mL的两口瓶中,加入0.417g 6,6’-二溴-[1,1’-联二萘]-2,2’-二胺1,1.059g三苯胺硼酸酯2,0.054g四(三苯基膦)钯,15ml四氢呋喃(THF),在氮气保护下搅拌5分钟。随后,将配好的碳酸钠溶液(8mL水+0.400g无水碳酸钠粉末)加入混合液中。所得溶液在氮气保护下回流搅拌20小时。冷却,减压蒸馏除掉溶剂。将粗产品萃取、分液和干燥,最后经柱层析(淋洗剂:石油醚/乙酸乙酯=2/1)分离制得0.267mg 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-[1,1’-联二萘]-2,2’-二胺3,产率64%。1H NMR(400MHz,d6-DMSO)δ(ppm):7.97(s,2H),7.82(d,J=9.16Hz,2H),7.52(d,J=8.4Hz,4H),7.40(d,J=8.8Hz,2H),7.25(d,J=9.52Hz,2H),7.03(d,J=8.64Hz,8H),6.92~6.84(m,14H),4.73(s,4H),3.73(s,12H).13C NMR(400MHz,d6-DMSO)δ(ppm):156.10,147.74,144.55,140.67,133.12,133.00,128.11,127.54,126.97,120.48,119.40,115.41,110.82,55.70.
实施例2:
以联二萘胺为母核的三苯胺类有机小分子5的合成路线:
Figure BDA0002108095680000061
在100mL的两口瓶中,加入0.540g 6,6’-二溴-N2,N2,N2’,N2’-四甲基-[1,1’-联二萘]-2,2’-二胺4,1.216g三苯胺硼酸酯2,0.054g四(三苯基膦)钯,15mL四氢呋喃(THF),在氮气保护下搅拌5分钟。随后,将配好的碳酸钠溶液(8mL水+0.400g无水碳酸钠粉末)加入混合液中。所得溶液在氮气保护下回流搅拌20小时。冷却,减压蒸馏除掉溶剂。将粗产品萃取、分液和干燥,最后经柱层析(淋洗剂:石油醚/乙酸乙酯=5/1)分离制得0.270mg 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2,N2’,N2’-四甲基-[1,1’-联二萘]-2,2’-二胺5,产率50%。1H NMR(400MHz,d6-DMSO)δ(ppm):8.06(s,2H),7.98(d,J=8.8Hz,2H),7.53~7.50(m,6H),7.37(d,J=9.04Hz,2H),7.05(d,J=9.04Hz,8H),6.97(d,J=8.16Hz,2H),6.93(d,J=9.08Hz,8H),6.83(d,J=9.04Hz,4H),3.74(s,12H),2.44(s,12H).13C NMR(400MHz,d6-DMSO)δ(ppm):156.29,149.76,148.08,140.47,135.12,133.34,131.94,130.15,129.24,127.62,127.24,126.48,125.72,125.18,124.54,121.40,120.16,115.52,55.73,43.64.
实施例3:
以联二萘胺为母核的三苯胺类有机小分子6的合成:
Figure BDA0002108095680000071
在100mL的两口瓶中,加入0.300g 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-[1,1’-联二萘]-2,2’-二胺3,0.237g 4-碘苯甲醚,0.00156g三(二亚苄基丙酮)二钯,0.00241g 2-环己基膦-2’,4’,6’-三异丙基联苯,0.115g叔丁醇钾,10mL叔丁醇,在氮气保护下95℃加热搅拌30个小时。冷却,减压蒸馏除掉溶剂。将粗产品萃取、分液和干燥,最后经柱层析(淋洗剂:石油醚/乙酸乙酯=1/1)分离制得0.219g 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-[1,1’-联二萘]-2,2’-二胺6,产率73%。1H NMR(400MHz,d6-DMSO)δ(ppm):8.05(s,2H),7.91(d,J=10.80Hz,2H),7.54(d,J=7.20Hz,4H),7.45(t,J1=8.64Hz,J2=7.84Hz,4H),7.05~6.99(m,14H),6.92(d,J=7.20Hz,8H),6.84(d,J=8.08Hz,4H),6.79(d,J=8.52Hz,4H),6.48(s,2H),3.74(s,12H),3.68(s,6H).13C NMR(400MHz,d6-DMSO)δ(ppm):156.18,155.21,147.98,142.30,140.58,136.53,134.42,133.34,132.37,129.61,129.13,127.62,127.02,125.72,125.08,123.13,120.27,118.65,115.52,114.76,55.79.
实施例4:
以联二萘胺为母核的三苯胺类有机小分子7的合成路线:
Figure BDA0002108095680000072
在一个100mL圆底烧瓶中依次加入0.3g 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-[1,1’-联二萘]-2,2’-二胺6,10mL四氢呋喃(THF),0.124g NaBH4,冰浴,搅拌。准备一个小烧杯,依次加入5mL四氢呋喃(THF),3mL 20%H2SO4溶液和0.3mL40%甲醛溶液,搅拌均匀后缓慢滴加入反应液中。滴毕,撤掉冰浴。常温搅拌70分钟后,倒入50mL 2%氢氧化钾溶液。将粗产品萃取、分液和干燥,最后经柱层析(淋洗剂:石油醚/乙酸乙酯=99/1)分离制得0.039mg 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-N2,N2’-二甲基-[1,1’-联二萘]-2,2’-二胺7。1H NMR(400MHz,d6-DMSO)δ(ppm):8.02(s,2H),7.74(d,J=8.00Hz,2H),7.09(d,J=8.00Hz,2H),7.00(d,J=4.00Hz,4H),6.91(d,J=8.00Hz,9H),6.77(d,J=8.00Hz,9H),6.67~6.61(m,6H),6.35(d,J=8.00Hz,4H),6.28(d,J=8.00Hz,4H),3.62(s,18H),2.41(s,6H).
附图1为实施例1-4制备的以联二萘胺为母核的三苯胺类有机小分子溶解于二氯甲烷中的循环伏安曲线。附图3为实施例1-4制备的以联二萘胺为母核的三苯胺类有机小分子作为空穴传输材料的钙钛矿太阳能电池的I-V曲线。结合图1和图3可以看出:本发明所制备的以联二萘胺为母核的三苯胺类有机小分子作为钙钛矿太阳能电池的空穴传输材料具有很好的光电转换性能。
实施例5:
以联二萘胺为母核的三苯胺类有机小分子3作为空穴传输材料制作钙钛矿太阳能电池,所制得太阳能电池结构如附图2所示,包括导电玻璃;二氧化钛膜;钙钛矿吸光层;空穴传输层;金属对电极。将三苯胺类有机小分子3用氯苯溶剂溶解配制成5mg/mL的溶液,3500r旋涂在洗净的ITO玻璃导电层上,在100℃下加热10分钟,然后放置室温,然后旋涂钙钛矿层前驱液、电子传输层和金属对电极。在AM 1.5-100mW/cm2的光强下进行测试,正扫条件下,电池的开路电压(Voc)为1038mV,短路电流密度(Jsc)为22.46mA cm-2,填充因子(FF)为0.74,光电转换效率为17.32%;反扫条件下,电池的开路电压(Voc)为1044mV,短路电流密度(Jsc)为22.68mA cm-2,填充因子(FF)为0.73,光电转换效率为17.28%。其光电流光电压曲线见图3。在相同条件下,采用PEDOT:PSS作为空穴传输材料,正扫条件下,电池的开路电压(Voc)为971mV,光电转换效率为14.69%,反扫条件下,电池的开路电压(Voc)为975mV,光电转换效率为14.36%。

Claims (5)

1.一种以联二萘胺为母核的三苯胺类有机空穴传输材料,其特征是具有如下化学结构:
Figure FDA0003755321560000011
式(I)中:R1为C1~C12烷氧基;R2和R3为甲氧基取代的C4~C20的芳环基,或为甲基,或为氢原子。
2.如权利要求1所述以联二萘胺为母核的三苯胺类有机空穴传输材料,其特征在于,所述以联二萘胺为母核的三苯胺类有机空穴传输材料为式3、式5、式6或式7所示化合物:
Figure FDA0003755321560000012
3.如权利要求2所述以联二萘胺为母核的三苯胺类有机空穴传输材料的制备方法,其特征在于式6的合成路线为:
Figure FDA0003755321560000013
在两口瓶中,加入0.300g 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-[1,1’-联二萘]-2,2’-二胺3,0.237g 4-碘苯甲醚,0.00156g三(二亚苄基丙酮)二钯,0.00241g 2-环己基膦-2’,4’,6’-三异丙基联苯,0.115g叔丁醇钾,10mL叔丁醇,在氮气保护下95℃加热搅拌30个小时;冷却,减压蒸馏除掉溶剂,将粗产品萃取、分液和干燥,最后经柱层析分离制得0.219g6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-[1,1’-联二萘]-2,2’-二胺6;其中柱层析的淋洗剂为:石油醚/乙酸乙酯=1/1。
4.如权利要求2所述以联二萘胺为母核的三苯胺类有机空穴传输材料的制备方法,其特征在于式7的合成路线为:
Figure FDA0003755321560000021
在一个100mL圆底烧瓶中依次加入0.3g 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-[1,1’-联二萘]-2,2’-二胺6,10mL四氢呋喃,0.124g NaBH4,冰浴,搅拌;准备一个小烧杯,依次加入5mL四氢呋喃,3mL 20%H2SO4溶液和0.3mL 40%甲醛溶液,搅拌均匀后缓慢滴加入反应液中;滴毕,撤掉冰浴,常温搅拌70分钟后,倒入50mL 2%氢氧化钾溶液,将粗产品萃取、分液和干燥,最后经柱层析分离制得0.039mg 6,6’-二(4-(二(4-甲氧苯基)氨基)苯)-N2,N2’-二(4-甲氧苯基)-N2,N2’-二甲基-[1,1’-联二萘]-2,2’-二胺7,其中柱层析的淋洗剂为:石油醚/乙酸乙酯=99/1。
5.如权利要求1所述的以联二萘胺为母核的三苯胺类有机空穴传输材料在制备钙钛矿太阳能电池中的应用。
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