Boosting charge extraction and efficiency of inverted perovskite solar cells through coordinating group modification at the buffer layer/cathode interface  

作　　者：Zhiqing Liang Ziqiu Ren Ziyu Wang Nan Yan Ling Li Bo Zhang Yanlin Song 

机构地区：[1]College of Chemistry,Zhengzhou University,Zhengzhou 450052,China [2]Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education,Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering,Shaanxi Normal University,Xi’an 710119,China [3]Key Laboratory of Green Printing,Institute of Chemistry,Chinese Academy of Sciences(ICCAS),Beijing Engineering Research Center of Nanomaterials for Green Printing Technology,National Laboratory for Molecular Sciences(BNLMS),Beijing 100190,China

出　　处：《Nano Research》2025年第1期415-423,共9页纳米研究（英文版）

基　　金：supported financially by the National Key R&D Program of China(No.2023YFE0111500);the National Natural Science Foundation of China(Nos.62204222,52103237,52321006,T2394480 and T2394484).

摘　　要：In inverted perovskite solar cells (PSCs),effective modification of the interface between the metalcathode and electron transport layer (ETL) is crucial forachieving high performance and stability. Herein, sulfonatedbathocuproine, commonly known as disodium bathocuproinedisulfonate (BCDS), was employed as a cathode buffer layerto address the interfacial issues at the [6,6]-phenyl-C61-butyricacid methyl ester (PCBM)/Ag interface. BCDS possesses theability to form coordinate bonds with Ag electrodes. Theutilization of the BCDS buffer layer enhanced the chargeextraction capability at the cathode interface whilesimultaneously achieving interfacial defect passivation,improving interfacial contact and increasing the built-in electricfield. Consequently, a power conversion efficiency (PCE) of25.06% was achieved. Furthermore, owing to the excellent filmforminguniformity of BCDS on PCBM, the stability of thedevice was also improved. After storage in dry air for morethan 2000 h, the device maintained 96% of its initial efficiency. This work underscores the remarkable potential of tailoringcoordination groups to enhance charge extraction efficiency at the ETL-cathode interface, unveiling a promising newfrontier in buffer layer development and performance optimization strategies for PSCs.

关 键 词：perovskite solar cells buffer layer bathocuproine disulfonate coordination group modification electron transport layer(ETL)-cathode interface 

分 类 号：TM914.4[电气工程—电力电子与电力传动]