材料科学
钙钛矿(结构)
掺杂剂
磁滞
硼
兴奋剂
能量转换效率
介孔材料
光电子学
纳米技术
化学工程
凝聚态物理
化学
催化作用
生物化学
有机化学
工程类
物理
作者
Xiaoqiang Shi,Yong Ding,Shijie Zhou,Bing Zhang,Molang Cai,Jianxi Yao,Linhua Hu,Jihuai Wu,Songyuan Dai,Mohammad Khaja Nazeeruddin
标识
DOI:10.1002/advs.201901213
摘要
Abstract Perovskite solar cells (PSCs) have witnessed astonishing improvement in power conversion efficiency (PCE), more recently, with advances in long‐term stability and scalable fabrication. However, the presence of an anomalous hysteresis behavior in the current density–voltage characteristic of these devices remains a key obstacle on the road to commercialization. Herein, sol–gel‐processed mesoporous boron‐doped TiO 2 (B‐TiO 2 ) is demonstrated as an improved electron transport layer (ETL) for PSCs for the reduction of hysteresis. The incorporation of boron dopant in TiO 2 ETL not only reduces the hysteresis behavior but also improves PCE of the perovskite device. The simultaneous improvements are mainly ascribed to the following two reasons. First, the substitution of under‐coordinated titanium atom by boron species effectively passivates oxygen vacancy defects in the TiO 2 ETL, leading to increased electron mobility and conductivity, thereby greatly facilitating electron transport. Second, the boron dopant upshifts the conduction band edge of TiO 2 , resulting in more efficient electron extraction with suppressed charge recombination. Consequently, a methylammonium lead iodide (MAPbI 3 ) photovoltaic device based on B‐TiO 2 ETL achieves a higher efficiency of 20.51% than the 19.06% of the pure TiO 2 ETL based device, and the hysteresis is reduced from 0.13% to 0.01% with the B‐TiO 2 based device showing negligible hysteresis behavior.
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