聚[3,4-乙烯二氧噻吩]:聚苯乙烯磺酸盐(PEDOT:PSS)因其制备工艺简单、导电性能良好、成膜均匀及成本低廉等优势,已成为倒置型钙钛矿太阳能电池(perovskite solar cells,PSCs)中空穴传输层的首选材料.然而,由PSS链中的磺酸基团所导致的...聚[3,4-乙烯二氧噻吩]:聚苯乙烯磺酸盐(PEDOT:PSS)因其制备工艺简单、导电性能良好、成膜均匀及成本低廉等优势,已成为倒置型钙钛矿太阳能电池(perovskite solar cells,PSCs)中空穴传输层的首选材料.然而,由PSS链中的磺酸基团所导致的酸性和吸湿性等问题,对PSCs器件的光电性能和长期稳定性都造成了不良影响.针对以上问题,本文采用向PEDOT:PSS溶液中加入适量碱性赖氨酸的方法,利用赖氨酸中的氨基与PSS链中的磺酸基团的中和反应以适度调节PEDOT:PSS的酸性,改善了沉积于其上的钙钛矿薄膜的成膜质量,提高了器件的光电性能和长期稳定性.实验结果表明:使用赖氨酸掺杂的PEDOT:PSS薄膜为空穴传输层(hole transport layer,HTL)制备的倒置型PSCs器件,其开路电压(open circuit voltage,V_(OC))从0.94 V(未掺杂的PEDOT:PSS薄膜为HTL的参考器件)提升至1.04 V,短路电流(short circuit current,J_(SC))从20.81 mA cm^(-2)(参考器件)增加到21.35 mA cm^(-2),光电转换效率(power conversion efficiency,PCE)从15.71%(参考器件)提高到17.65%.此外,将未封装的赖氨酸掺杂的PSCs器件在氮气氛围(25℃)中存储2160 h后,其PCE保持为初始效率的86.54%;而在空气环境(25℃@15%相对湿度)中储存360 h后,其PCE仍能保持初始效率的85.88%.总的说来,将碱性赖氨酸作为掺杂剂引入PEDOT:PSS溶液,不仅能够适度中和PEDOT:PSS的酸性,还能改善钙钛矿薄膜的结晶性能和成膜质量,为实现高效稳定的倒置PSCs提供了一种新的思路.展开更多
Inverted perovskite solar cells using pristine PEDOT:PSS as the hole-transporting layer (HTL) have been widely studied for its less hysteresis and low-temperature preparation technologies. However, this device suffers...Inverted perovskite solar cells using pristine PEDOT:PSS as the hole-transporting layer (HTL) have been widely studied for its less hysteresis and low-temperature preparation technologies. However, this device suffers from an inferior open-circuit voltage (VOC) and stability problems. Several attempts have made on film formation and interface engineering to improve the efficiency. Modification proved beneficial to decrease energy offset at the interface between the HTL layer and the adjacent perovskite layer. In this paper, modification PEDOT:PSS layers were realized with a dimethyl formamide (DMF) solvent. The sulfonic acid distribution was homogenized in the normal directi on after modification. The work function of the modified PEDOT:PSS layers increased from 4.71 to 5.07eV, and the conductivity of modified PEDOT:PSS increased from 3×10^-4 to 0.45 S/cm. The as-deposited perovskite films were more uniform with larger grain sizes and less pinholes, resulting in an improved VOC from 0.93 to 1.048 V, while the efficiency was increased from 11.5% to 16.8%. Solar cells without encapsulation under the 50 h and 50% humidity aging test showed 7% degradation of fill factor (FF) with 50 v/v% PEDOT:PSS layer, while the fill factor decreased 11.2% in the 0 v/v% PEDOT:PSS layer, respectively.展开更多
基金supported by the National Natural Science Foundation of China(51672202,21673170)the Technological Innovation Key Project of Hubei Province,China(2016AAA041)the Fundamental Research Funds for the Central Universities,China(WUT:2016IVA085)~~
文摘聚[3,4-乙烯二氧噻吩]:聚苯乙烯磺酸盐(PEDOT:PSS)因其制备工艺简单、导电性能良好、成膜均匀及成本低廉等优势,已成为倒置型钙钛矿太阳能电池(perovskite solar cells,PSCs)中空穴传输层的首选材料.然而,由PSS链中的磺酸基团所导致的酸性和吸湿性等问题,对PSCs器件的光电性能和长期稳定性都造成了不良影响.针对以上问题,本文采用向PEDOT:PSS溶液中加入适量碱性赖氨酸的方法,利用赖氨酸中的氨基与PSS链中的磺酸基团的中和反应以适度调节PEDOT:PSS的酸性,改善了沉积于其上的钙钛矿薄膜的成膜质量,提高了器件的光电性能和长期稳定性.实验结果表明:使用赖氨酸掺杂的PEDOT:PSS薄膜为空穴传输层(hole transport layer,HTL)制备的倒置型PSCs器件,其开路电压(open circuit voltage,V_(OC))从0.94 V(未掺杂的PEDOT:PSS薄膜为HTL的参考器件)提升至1.04 V,短路电流(short circuit current,J_(SC))从20.81 mA cm^(-2)(参考器件)增加到21.35 mA cm^(-2),光电转换效率(power conversion efficiency,PCE)从15.71%(参考器件)提高到17.65%.此外,将未封装的赖氨酸掺杂的PSCs器件在氮气氛围(25℃)中存储2160 h后,其PCE保持为初始效率的86.54%;而在空气环境(25℃@15%相对湿度)中储存360 h后,其PCE仍能保持初始效率的85.88%.总的说来,将碱性赖氨酸作为掺杂剂引入PEDOT:PSS溶液,不仅能够适度中和PEDOT:PSS的酸性,还能改善钙钛矿薄膜的结晶性能和成膜质量,为实现高效稳定的倒置PSCs提供了一种新的思路.
基金funded by the National Natural Science Foundation of China(No.51672111)Advanced Talents Program of Hebei Province(No.GCC2014013)+1 种基金Top Young Outstanding Innovative Talents Program of Hebei Province(No.BJ2014009)the Natural Science Foundation of Hebei Probince(No.F2015201189)
文摘Inverted perovskite solar cells using pristine PEDOT:PSS as the hole-transporting layer (HTL) have been widely studied for its less hysteresis and low-temperature preparation technologies. However, this device suffers from an inferior open-circuit voltage (VOC) and stability problems. Several attempts have made on film formation and interface engineering to improve the efficiency. Modification proved beneficial to decrease energy offset at the interface between the HTL layer and the adjacent perovskite layer. In this paper, modification PEDOT:PSS layers were realized with a dimethyl formamide (DMF) solvent. The sulfonic acid distribution was homogenized in the normal directi on after modification. The work function of the modified PEDOT:PSS layers increased from 4.71 to 5.07eV, and the conductivity of modified PEDOT:PSS increased from 3×10^-4 to 0.45 S/cm. The as-deposited perovskite films were more uniform with larger grain sizes and less pinholes, resulting in an improved VOC from 0.93 to 1.048 V, while the efficiency was increased from 11.5% to 16.8%. Solar cells without encapsulation under the 50 h and 50% humidity aging test showed 7% degradation of fill factor (FF) with 50 v/v% PEDOT:PSS layer, while the fill factor decreased 11.2% in the 0 v/v% PEDOT:PSS layer, respectively.
