Pb‐Reduced CsPb0.9Zn0.1I2Br Thin Films for Efficient Perovskite Solar Cells

Fabrication of efficient Pb reduced inorganic CsPbI2Br perovskite solar cells (PSC) are an important part of environment‐friendly perovskite technology. In this work, 10% Pb reduction in CsPb0.9Zn0.1I2Br promotes the efficiency of PSCs to 13.6% (AM1.5, 1sun), much higher than the 11.8% of the pure C...

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Bibliographic Details
Published in:Advanced energy materials 2019-07, Vol.9 (25), p.n/a
Main Authors: Sun, Hongrui, Zhang, Jing, Gan, Xinlei, Yu, Luting, Yuan, Haobo, Shang, Minghui, Lu, Chaojie, Hou, Dagang, Hu, Ziyang, Zhu, Yuejin, Han, Liyuan
Format: Article
Language:English
Subjects:
Charge transport
Crystal growth
Crystal structure
crystalline growth mechanism
Crystallites
doping
energy band structure
Grain boundaries
less Pb inorganic perovskite
Morphology
perovskite solar cells
Perovskites
Photovoltaic cells
Reduction
Solar cells
Thin films
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Summary:Fabrication of efficient Pb reduced inorganic CsPbI2Br perovskite solar cells (PSC) are an important part of environment‐friendly perovskite technology. In this work, 10% Pb reduction in CsPb0.9Zn0.1I2Br promotes the efficiency of PSCs to 13.6% (AM1.5, 1sun), much higher than the 11.8% of the pure CsPbI2Br solar cell. Zn2+ 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 CsPb0.9Zn0.1I2Br 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. 10% Pb reduction in CsPb0.9Zn0.1I2Br boosts the efficiency of the solar cell device. Zn2+ results in high quality crystalline and energy state modulation, greatly reducing the trap states and promoting the charge transport in the device. This work highlights that Zn is an effective and stable Pb reducer that compares well to the chemical unstable Sn, in efficient CsPbX3 based PSCs.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201900896