Premium
Pb‐Reduced CsPb 0.9 Zn 0.1 I 2 Br Thin Films for Efficient Perovskite Solar Cells
Author(s) -
Sun Hongrui,
Zhang Jing,
Gan Xinlei,
Yu Luting,
Yuan Haobo,
Shang Minghui,
Lu Chaojie,
Hou Dagang,
Hu Ziyang,
Zhu Yuejin,
Han Liyuan
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201900896
Subject(s) - materials science , perovskite (structure) , crystallite , band gap , solar cell , fabrication , grain boundary , perovskite solar cell , energy conversion efficiency , grain size , absorption (acoustics) , nanotechnology , chemical engineering , crystallography , optoelectronics , chemistry , metallurgy , medicine , alternative medicine , microstructure , pathology , engineering , composite material
Fabrication of efficient Pb reduced inorganic CsPbI 2 Br perovskite solar cells (PSC) are an important part of environment‐friendly perovskite technology. In this work, 10% Pb reduction in CsPb 0.9 Zn 0.1 I 2 Br promotes the efficiency of PSCs to 13.6% (AM1.5, 1sun), much higher than the 11.8% of the pure CsPbI 2 Br solar cell. Zn 2+ has stronger interaction with the anions to manipulate crystal growth, resulting in size‐enlarged crystallite with enhanced growth orientation. Moreover, the grain boundaries (GBs) are passivated by the Cs‐Zn‐I/Br compound. The high quality CsPb 0.9 Zn 0.1 I 2 Br greatly diminishes the GB trap states and facilitates the charge transport. Furthermore, the Zn4s‐I5p states slightly reduce the energy bandgap, accounting for the wider solar spectrum absorption. Both the crystalline morphology and energy state change benefit the device performance. This work highlights a nontoxic and stable Pb reduction method to achieve efficient inorganic PSCs.