材料科学
结晶
钙钛矿(结构)
对偶(语法数字)
接口(物质)
化学工程
结晶学
复合材料
化学
艺术
文学类
毛细管数
毛细管作用
工程类
作者
Yiting Zheng,Congcong Tian,Xueyun Wu,Anxin Sun,Rongshan Zhuang,Chen Tang,Yuan Liu,Zihao Li,Beilin Ouyang,Jiajun Du,Ziyi Li,Xiling Wu,Jinling Chen,Jinhua Cai,Chun‐Chao Chen
标识
DOI:10.1002/aenm.202304486
摘要
Abstract In a methylammonium‐free (MA‐free) composition, the uncontrollable crystallization process between Cs and formamidine (FA) currently hinders its efficiency enhancement, especially in inverted perovskite solar cells (PSCs). Here, a dual‐interface modification of perovskite films is proposed by simultaneously introducing additives and surface passivators. In particular, (aminomethyl)phosphonic acid (AMP) is introduced into the precursor solution to balance crystallization by inducing the preferential crystallization of FA through the specific formation of strong hydrogen bonds with FA. In addition, AMP spontaneously sinks and anchors to the buried interface to fill the voids of the self‐assembled monolayer (SAM) via the covalent bonds formed by ─PO 3 H 2 and FTO. Subsequently, by the sequential modification of perovskite surface with 2‐(3‐fluorophenyl)ethylamine iodide (mF‐PEAI) and piperazine diiodide (PDI), a uniform surface potential is achieved and recombination losses at the interface are minimized. Notably, the dual‐interface‐modified inverted MA‐free PSCs achieve a state‐of‐the‐art power conversion efficiency (PCE) of 25.35% (certified: 24.87%) with a satisfactory V oc of 1.17 V based on the bandgap of 1.52 eV. Importantly, the unencapsulated devices maintain 92.8% and 91.7% of the initial efficiency after 1000 h of maximum power output (MPP) tracking and >800 h of heating at 85 °C, respectively, confirming excellent operational and thermal stability.
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