介观物理学
钙钛矿(结构)
导线
材料科学
电极
图层(电子)
电子传输链
碳纤维
分子
光电子学
化学工程
凝聚态物理
复合材料
化学
物理化学
物理
生物化学
有机化学
复合数
工程类
作者
De’en Guo,Xiaobin Yu,Zhenxing Fang,Heng Peng,Haipeng Xie,Han Huang,De‐Ming Kong,Conghua Zhou
标识
DOI:10.1002/solr.202400021
摘要
Interfacial contact between “perovskite/electron‐transport layer” (PVSK/ETL) has appeared as a bottleneck for the hole‐conductor‐free, mesoscopic perovskite solar cells (meso‐CPSCs) based on carbon electrode, especially for the low‐temperature devices. To solve this problem, hydroxypropyl‐β‐cyclodextrin is imported to TiO 2 ‐based ETL. It is observed that this treatment improves the wettability of ETL, enhances the crystallization processes of PVSK in the mesoporous skeleton, and strengthens the interfacial contact between “PVSK/ETL”. Besides, defects are reduced at the interface. Accordingly, charge extraction is accelerated, while recombination is retarded. Transient photovoltage/photocurrent decay curve test shows that the charge‐extraction time decreases from 3.75 (±0.38) to 3.42 (±0.22) μs, while lifetime of photogenerated charges in device is prolonged from 10.00 (±2.38) to 12.23 (±1.86) μs, which helps to upgrade power μconversion efficiency from 9.38 (±1.28)% to 11.42 (±0.80)% (optimized at 12.44%). The efficiency is further upgraded to 14.04% after modifying the carbon electrode with octylammonium iodide. Such efficiency catches up with 85% of that of high‐temperature meso‐CPSCs (prepared at 450 °C) when using (5‐AVA) x (MA) 1− x PbI 3 as light absorber. The study paves the way to further upgrade the efficiency of the low‐temperature meso‐CPSCs.
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