Ren Xuefei, Wang Shuqi, Cai Hengzhuo, Qiu Peng, Wang Qiwei, Lu Xubing, Gao Xingsen, Shui Lingling, Wu Sujuan, Liu Jun-Ming
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
Langmuir. 2024 Sep 12. doi: 10.1021/acs.langmuir.4c01681.
Due to the easy oxidation of Sn, which leads to form tin vacancy defects and poor perovskite film quality, caused by the rapid crystallization rate in tin-based perovskite solar cells (PSCs), their efficiency lags far behind that of lead-based PSCs. To improve the photovoltaic (PV) performance and stability of FAPEASnI-based PSCs (T-PSCs), a small amount of Pb(SCN) is introduced into a perovskite precursor as an antioxidant, and acetaminophen (ACE) with various functional groups is used to modify a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/perovskite interface. The results show that the Pb(SCN) additive and ACE interfacial modification can not only optimize energy level alignment in T-PSCs but also inhibit Sn oxidation to reduce the trap-state density, resulting in promoted carrier transport. The synergetic effect of the Pb(SCN) antioxidant and ACE interfacial modification significantly reduces nonradiative recombination and improves the PV performance and stability of T-PSCs. Consequently, the unsealed T-PSCs with the Pb(SCN) additive and ACE modification achieve a champion efficiency of 12.04% and maintain 99% of their initial PCE after being stored in N for more than 2100 h, while reference T-PSCs demonstrate a champion PCE of 6.20% and retain only 72% of its initial PCE. Moreover, the modified T-PSCs without encapsulation demonstrate much better stability in humid air.
由于锡容易氧化，导致在锡基钙钛矿太阳能电池（PSC）中形成锡空位缺陷且钙钛矿薄膜质量较差，这是由其快速的结晶速率造成的，它们的效率远远落后于铅基PSC。为了提高基于FAPEASnI的PSC（T-PSC）的光伏（PV）性能和稳定性，将少量的Pb(SCN)作为抗氧化剂引入钙钛矿前驱体中，并使用具有各种官能团的对乙酰氨基酚（ACE）来修饰聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）/钙钛矿界面。结果表明，Pb(SCN)添加剂和ACE界面修饰不仅可以优化T-PSC中的能级排列，还可以抑制锡氧化以降低陷阱态密度，从而促进载流子传输。Pb(SCN)抗氧化剂和ACE界面修饰的协同效应显著降低了非辐射复合，提高了T-PSC的PV性能和稳定性。因此，具有Pb(SCN)添加剂和ACE修饰的未封装T-PSC实现了12.04%的最高效率，并在氮气中储存超过2100小时后保持其初始光电转换效率（PCE）的99%，而参考T-PSC的最高PCE为6.20%，仅保留其初始PCE的72%。此外，未封装的修饰T-PSC在潮湿空气中表现出更好的稳定性。
