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Low-Dimensional 2-thiopheneethylammonium Lead Halide Capping Layer Enables Efficient Single-Junction Methylamine-Free Wide-Bandgap and Tandem Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-04-17 , DOI: 10.1002/adfm.202300860
Hongling Guan 1 , Wenjun Zhang 1 , Jiwei Liang 1 , Chen Wang 1 , Xuzhi Hu 1 , Dexing Pu 1 , Lishuai Huang 1 , Yansong Ge 1 , Hongsheng Cui 1 , Yuanrong Zou 1 , Guojia Fang 1 , Weijun Ke 1
Affiliation  

Wide-bandgap (WBG) perovskite solar cells (PSCs) have garnered significant attention for their potential applications in tandem solar cells. However, their large open-circuit voltage (VOC) deficit and serious photo-induced halide segregation remain the main challenges that impede their applications. Herein, a post-treatment strategy without thermal annealing is presented to form a 2D top layer of 2-thiopheneethylammonium lead halide (n = 1) on WBG perovskites. This thermal annealing-free post-treatment method can more effectively passivate the defects of WBG methylamine (MA)-free formamidinium/cesium lead iodide/bromide perovskite films and suppress photo-induced perovskite phase segregation, as compared with the thermal annealing method that yields multi-2D phases. The resulting opaque and semi-transparent 1.66 eV-bandgap perovskite solar cells deliver maximum power conversion efficiencies of 21.47% (a small VOC deficit of 0.43 V) and 19.11%, respectively, both of which are among the highest reports for inverted MA-free WBG PSCs. Consequently, four-terminal all-perovskite tandem cells realize a remarkable efficiency of 26.64%, showing great promise for their applications in efficient multi-junction tandem solar cells.

中文翻译:

低维 2-噻吩乙基铵卤化铅覆盖层可实现高效单结无甲胺宽带隙和串联钙钛矿太阳能电池

宽带隙(WBG)钙钛矿太阳能电池(PSC)因其在串联太阳能电池中的潜在应用而受到广泛关注。然而,它们的大开路电压(VOC)缺陷和严重的光致卤化物偏析仍然是阻碍其应用的主要挑战本文提出了一种无需热退火的后处理策略,以形成 2-噻吩乙基铵卤化铅的 2D 顶层(n = 1) 在WBG钙钛矿上。与产生多二维相的热退火方法相比,这种免热退火后处理方法可以更有效地钝化无WBG甲胺(MA)的甲脒/铯碘化铅/溴化物钙钛矿薄膜的缺陷,并抑制光致钙钛矿相偏析。由此产生的不透明和半透明 1.66 eV 带隙钙钛矿太阳能电池的最大功率转换效率分别为 21.47%(0.43 V 的小VOC缺陷)和 19.11%,这两者都是反向无 MA WBG PSC 的最高报告之一。因此,四端全钙钛矿串联电池实现了26.64%的显着效率,显示出其在高效多结串联太阳能电池中的巨大应用前景。
更新日期:2023-04-17
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