Publication date: 17th February 2025
All-inorganic CsPbIxBr3-x perovskite materials have been a promising research subject in emerging perovskite solar cells (PSCs) due to their excellent thermal stability and rapid progression in photovoltaic performance.[1] However, there are still some foremost challenges such as limited absorption range, poor phase stability, and serious defect-traps, hindering further developments of inorganic perovskite materials. Recently, partial substitution of Pb2+ (B-site cation) with other metal ions has been shown to tune the energy levels, align the tolerance factor, and reduce the defect-states of all inorganic perovskite thin films. In line with these studies, the B-site doping strategy can be considered as one of the most important lattice engineering approaches to not only improve the photovoltaic performance but also prolong the stability of all-inorganic PSCs.
Herein, a compositional engineering approach to tune the CsPbI2Br crystallization by incorporating various B-site metal dopants will be presented.[2] Special attention will be put on doping CsPbI2Br perovskite film with novel palladium (Pd2+) complexes. The optimized amount of Pd2+ complex not only stabilize the black α-phase but also improves the morphology and optoelectronic properties of perovskite film. Besides, the proposed modification thoroughly aligns the energy level, promotes the built-in potential, and reduces the defect states in the perovskite, resulting in a high power conversion efficiency (PCE) of 16.4% with a remarkable open-circuit voltage (VOC) of 1.27 V. Moreover, the fabricated CsPbI2Br PSCs deliver remarkable improvement in environmental and operational stabilities with decent PCE. Finally, challenges and cutting-edge engineering approaches for optimizing the PV performance of all-inorganic PSCs will be presented.
D. P. acknowledge the National Science Centre (grant SONATA BIS 10, no. 2020/38/E/ST5/00267) for financial support.
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