钙钛矿(结构)
材料科学
钝化
石墨烯
能量转换效率
晶界
电子迁移率
接受者
载流子
氧化物
光电子学
钙钛矿太阳能电池
纳米技术
化学工程
图层(电子)
冶金
工程类
物理
微观结构
凝聚态物理
作者
Xuemiao Sun,Benlin He,Jing Wang,Rui Zhu,Haiyan Chen,Yanyan Duan,Qunwei Tang
标识
DOI:10.1016/j.cej.2021.128727
摘要
The perovskite film with large grain size and high charge mobility is critical for the improvement of the power conversion efficiency (PCE) and the operational stability of perovskite solar cells (PSCs). Herein, multifunctional brominated graphene oxide (Br-GO) is prepared and innovatively used as an effective additive to incorporate into CsPbBr3 to form a large-grained high-quality perovskite film and to passivate defects at grain boundaries, which remarkably reduces the trap state density and carrier non-radiative recombination. Meanwhile, the hole mobility of the homogeneous CsPbBr3 + Br-GO photoactive layer is obviously increased due to the hole acceptor properties and high carrier mobility of Br-GO, resulting in an enhanced charge separation as well as transfer and suppressed carrier radiative recombination. Moreover, the Br-GO with a downshift valence band is employed as a hole-transporting material setting at perovskite/Carbon interface to further compensate energy levels and promote hole extraction. As a consequence, a champion PCE of 10.10% with an open-circuit voltage up to 1.602 V for the optimized PSCs with a configuration of FTO/c-TiO2/m-TiO2/CsPbBr3 + Br-GO/Br-GO/Carbon is obtained, which is much higher than 6.28% efficiency for the reference device. The unencapsulated solar cells also exhibit a remarkable tolerance toward 85% RH and long-term AM 1.5G illumination in air.
科研通智能强力驱动
Strongly Powered by AbleSci AI