锡
钙钛矿(结构)
材料科学
齿合度
晶界
卤化物
化学工程
能量转换效率
粒度
图层(电子)
纳米技术
光电子学
无机化学
化学
金属
冶金
微观结构
工程类
作者
Dhruba B. Khadka,Yasuhiro Shirai,Masatoshi Yanagida,Terumasa Tadano,Kenjiro Miyano
标识
DOI:10.1021/acs.chemmater.3c00243
摘要
Tin-perovskite solar cells (Sn-PSCs) have low energy conversion efficiency and stability due to facile oxidation of Sn2+ during precursor solution preparation and film growth. Herein, we introduced formohydrazide (FHZ) as a bidentate ligand into the Sn-halide perovskite (Sn-HaP) to improve the optoelectronic properties. This approach is found to be effective for the suppression of Sn-oxidation and interfacial energy band modulation. The depth profile distribution confirmed that the FHZ additive is primarily located on surfaces and the hole transport layer (HTL)/Sn-HaP interface with partly capping at the grain boundaries, which offers a reducing ambient in the Sn-HaP film. Therefore, the device with FHZ demonstrated a device efficiency of 12.87% (9.93% control) with enhanced open circuit voltage from ∼0.734 to 0.874 V and improved operational device stability. The device analysis suggests that the FHZ additive alleviates the bulk and interface defect in the Sn-PSC with −NH2 and −O═C bidentate bonding to Sn-HaP, which is supported by theoretical calculations. Thus, this work corroborates the importance of multidentate ligands for modulating the film morphology and defect chemistry in the Sn-perovskite for high efficiency and superior device stability.
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