Monovalent Copper Cation Doping Enables High-Performance CsPbIBr<sub>2</sub>-Based All-Inorganic Perovskite Solar Cells

Organic–inorganic perovskite solar cells (PSCs) have delivered the highest power conversion efficiency (PCE) of 25.7% currently, but they are unfortunately limited by several key issues, such as inferior humid and thermal stability, significantly retarding their widespread application. To tackle the...

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Bibliographic Details
Main Authors: Zhaonan Du, Huimin Xiang, Amin Xie, Ran Ran, Wei Zhou, Wei Wang, Zongping Shao
Format: Article
Language:English
Published: MDPI AG 2022-12-01
Series:Nanomaterials
Subjects:
Online Access:https://www.mdpi.com/2079-4991/12/23/4317
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Summary:Organic–inorganic perovskite solar cells (PSCs) have delivered the highest power conversion efficiency (PCE) of 25.7% currently, but they are unfortunately limited by several key issues, such as inferior humid and thermal stability, significantly retarding their widespread application. To tackle the instability issue, all-inorganic PSCs have attracted increasing interest due to superior structural, humid and high-temperature stability to their organic–inorganic counterparts. Nevertheless, all-inorganic PSCs with typical CsPbIBr<sub>2</sub> perovskite as light absorbers suffer from much inferior PCEs to those of organic–inorganic PSCs. Functional doping is regarded as a simple and useful strategy to improve the PCEs of CsPbIBr<sub>2</sub>-based all-inorganic PSCs. Herein, we report a monovalent copper cation (Cu<sup>+</sup>)-doping strategy to boost the performance of CsPbIBr<sub>2</sub>-based PSCs by increasing the grain sizes and improving the CsPbIBr<sub>2</sub> film quality, reducing the defect density, inhibiting the carrier recombination and constructing proper energy level alignment. Consequently, the device with optimized Cu<sup>+</sup>-doping concentration generates a much better PCE of 9.11% than the pristine cell (7.24%). Moreover, the Cu<sup>+</sup> doping also remarkably enhances the humid and thermal durability of CsPbIBr<sub>2</sub>-based PSCs with suppressed hysteresis. The current study provides a simple and useful strategy to enhance the PCE and the durability of CsPbIBr<sub>2</sub>-based PSCs, which can promote the practical application of perovskite photovoltaics.
ISSN:2079-4991