Open AccessCsPbBr 3 Nanocrystal Induced Bilateral Interface Modification for Efficient Planar Perovskite Solar Cells
Author(s) -
Zhang Jianjun,
Wang Linxi,
Jiang Chenhui,
Cheng Bei,
Chen Tao,
Yu Jiaguo
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202102648
Subject(s) - perovskite (structure) , materials science , halide , nanocrystal , energy conversion efficiency , kelvin probe force microscope , charge carrier , planar , doping , optoelectronics , absorption (acoustics) , photovoltaic system , nanotechnology , chemical engineering , chemistry , inorganic chemistry , atomic force microscopy , composite material , biology , ecology , computer graphics (images) , computer science , engineering
Organic‐inorganic halide perovskite solar cells (PSCs) have drawn tremendous attention owing to their remarkable photovoltaic performance and simple preparation process. However, conventional wet‐chemical synthesis methods inevitably create defects both in the bulk and at the interfaces of perovskites, leading to recombination of charge carriers and reduced stability. Herein, a bilateral interface modification to perovskites by doping room‐temperature synthesized CsPbBr 3 nanocrystals (CN) is reported. The ultrafast transient absorption measurement reveals that CN effectively suppresses the defect at the SnO 2 /perovskite interface and boosts the interfacial electron transport. Meanwhile, the in situ Kelvin probe force microscopy and contact potential difference characterizations verify that the CN within the upper part of the perovskites enhances the built‐in electric field, facilitating oriented migration of the carriers within the perovskite. Combining the superiorities of CN modifiers on both sides, the bilaterally modified CH 3 NH 3 PbI 3 ‐based planar PSCs exhibit optimal power conversion efficiency exceeding 20% and improved device stability.