钙钛矿(结构)
掺杂剂
结晶度
材料科学
兴奋剂
化学工程
纳米技术
无机化学
光电子学
化学
复合材料
工程类
作者
Feifei Wang,Xiaoyu Shi,Yu Han,Lingyuan Wang,Zhaoyu Ren,Shangshang Chen
出处
期刊:Small
[Wiley]
日期:2023-12-27
标识
DOI:10.1002/smll.202306425
摘要
Abstract N doping is an essential strategy to prolong electron diffusion length and improve the photovoltaic performance of p–i–n structured perovskite solar devices, but current n‐dopants generally suffer from air instability, poor compatibility with perovskites, and the compensation from perovskite intrinsic defects, thus limiting their doping effectiveness. To address these issues, in this work, a new perovskite n‐doping strategy is developed by incorporating an air‐stable n‐dopant (1‐ethyl‐3‐methylimidazolium‐2‐carboxylate, EMIC) that has no detrimental effects on perovskite crystallinity and morphology. EMIC is soluble in most polar solvents and can be readily introduced into perovskite precursor solutions. Upon thermal annealing of perovskite films, the decarboxylation of EMIC releases imidazolylidene, a reactive species that highly tends to donate electrons and thus efficiently prolongs the electron diffusion length from 0.57 µm to over 1.21 µm. As a result, the blade‐coated perovskite solar cells and modules realize high power conversion efficiencies of 24.3% and 20.6% at 7.4 mm 2 and 25.0 cm 2 aperture areas, respectively.
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