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Sodium Benzenesulfonate Modified Poly (3,4‐Ethylenedioxythiophene):Polystyrene Sulfonate with Improved Wettability and Work Function for Efficient and Stable Perovskite Solar Cells
Solar RRL ( IF 7.9 ) Pub Date : 2020-11-04 , DOI: 10.1002/solr.202000573
Wei Li 1 , Huaxin Wang 1 , Xiaofei Hu 1 , Wensi Cai 1 , Cong Zhang 1 , Ming Wang 1 , Zhigang Zang 1
Affiliation  

The p‐type conducting polymer poly (3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is widely utilized as the hole transport layer (HTL) for solution‐processed planar perovskite solar cells (PSCs) with a p‐i‐n structure. However, the inverted PSCs based on PEDOT:PSS HTL suffer from deficient open‐circuit voltage (VOC) and poor stability issues, because of the high electron affinity and acid nature of PEDOT:PSS. Herein, sodium benzenesulfonate (C6H5SO3Na) (SBS) is applied to modify the PEDOT:PSS (SBS–PEDOT:PSS) layer to form a smoother surface and better energy‐level alignment with the perovskite layer. In addition, the SBS–PEDOT:PSS layer with improved hole extraction capacity and suppressed charge recombination, significantly increases the grain size and crystallinity of the MA0.8FA0.2PbI3‐xClx perovskite film. Consequently, the power conversion efficiency (PCE) and VOC of the inverted PSCs are improved from 18.07% and 1.04 V to 19.41% and 1.08 V, respectively, after SBS modification. Moreover, the efficiency of the unencapsulated PSCs based on SBS–PEDOT:PSS remains above 90% after storing in ambient condition for 20 days. This research provides an accessible route to surmount the intrinsic imperfection of PEDOT:PSS and ameliorate the performance of PSCs.

中文翻译:

苯磺酸磺酸钠修饰的聚(3,4-乙撑二氧噻吩):具有高润湿性和功函数的聚苯乙烯磺酸盐,用于高效稳定的钙钛矿太阳能电池

p型导电聚合物聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐(PEDOT:PSS)被广泛用作ap-i-n固溶钙钛矿型太阳能电池(PSC)的空穴传输层(HTL)。结构体。但是,由于PEDOT:PSS的高电子亲和力和酸性质,基于PEDOT:PSS HTL的反向PSC会遇到开路电压(V OC)不足和稳定性差的问题。此处为苯磺酸钠(C 6 H 5 SO 3Na)(SBS)用于修改PEDOT:PSS(SBS–PEDOT:PSS)层,以形成更光滑的表面和与钙钛矿层更好的能级对齐。此外,具有改善的空穴提取能力和抑制的电荷复合的SBS-PEDOT:PSS层显着增加了MA 0.8 FA 0.2 PbI 3- x Cl x钙钛矿薄膜的晶粒尺寸和结晶度。因此,功率转换效率(PCE)和V OC经过SBS修改后,反向PSC的电压分别从18.07%和1.04 V提高到19.41%和1.08V。此外,在环境条件下存放20天后,基于SBS–PEDOT:PSS的未封装PSC的效率保持在90%以上。这项研究为克服PEDOT:PSS的内在缺陷并改善PSC的性能提供了一条可行的途径。
更新日期:2021-01-07
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