PEDOT:PSS‐Metal Oxide Composite Electrode with Regulated Wettability and Work Function for High‐Performance Inverted Perovskite Solar Cells,Advanced Optical Materials

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PEDOT:PSS‐Metal Oxide Composite Electrode with Regulated Wettability and Work Function for High‐Performance Inverted Perovskite Solar Cells
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-06-11 , DOI: 10.1002/adom.202000216
Chenghao Duan ₁ , Zidan Liu ₁ , Ligang Yuan ₁ , Hepeng Zhu ₁ , Huiming Luo ₁ , Keyou Yan ₁

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Poly(3,4‐ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) can be roll‐to‐roll deposited on the substrate facilely in the electronics, but its acidity and mismatched energy level limit the performance and stability. Herein, different metal salts are incorporated into PEDOT:PSS solution to prepare PEDOT:PSS‐A_xO_y (metal oxide) composite hole transport layer and it is found that the performance of inverted perovskite solar cells (PSCs) can be greatly enhanced. PSC using PEDOT:PSS‐MoO_x has achieved much higher power conversion efficiency (PCE) (19.64%) than that of pristine PEDOT:PSS (12.19%). Two key factors are important for the performance enhancement. First, the increased surface free energy of PEDOT:PSS‐A_xO_y is beneficial for the formation of large crystal size and pinhole‐free film, leading to reduced nonradiative recombination. Second, the work function of PEDOT:PSS can be tuned to match the energy level of photoactive layer with small amount incorporation, which greatly enhances the photovoltage by a factor of 1.1. Besides, the devices based on PEDOT:PSS‐A_xO_y exhibit improved long‐term stability. Unencapsulated PSCs with PEDOT:PSS‐MoO_x retain over 90% and 80% of their initial PCEs in N₂ for 45 d and in ambient air for 20 d, respectively. The modified PEDOT:PSS solutions overcome the intrinsic imperfection and can be potentially employed for large‐scale production in the electronic devices.

中文翻译：

PEDOT：PSS金属氧化物复合电极，具有可调节的润湿性和功函数，适用于高性能倒钙钛矿太阳能电池

聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）可以在电子设备中方便地逐卷沉积在基材上，但是其酸度和不匹配的能级限制了其性能和稳定性。在本文中，将不同的金属盐掺入PEDOT：PSS溶液中以制备PEDOT：PSS-A _x O _y（金属氧化物）复合空穴传输层，并且发现可以大大提高倒钙钛矿太阳能电池（PSC）的性能。使用PEDOT：PSS-MoO _x的PSC与原始PEDOT：PSS（12.19％）相比，实现了更高的功率转换效率（PCE）（19.64％）。两个关键因素对于性能增强很重要。首先，PEDOT：PSS‐A _x O _y的表面自由能增加有助于形成大尺寸的晶体和无针孔的薄膜，从而减少了非辐射复合。其次，可以调整PEDOT：PSS的功函数以使其与光敏层的能级相匹配，而掺入的量很少，这可以将光电压大大提高1.1倍。此外，基于PEDOT：PSS‐A _x O _{y的设备还}具有更高的长期稳定性。具有PEDOT：PSS-MoO _x的未封装PSC在N ₂中分别保留90％和80％的初始PCE 45 d，在环境空气中保留20 d。修改后的PEDOT：PSS解决方案克服了固有缺陷，可潜在地用于电子设备的大规模生产。

更新日期：2020-06-11

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