Positive Effects of Guanidinium Salt Post-Treatment on Multi-Cation Mixed Halide Perovskite Solar Cells
Aidarkhanov D. Idu I.H. Zhou X. Duan D. Wang F. Hu H. Ng A.
July 2024Multidisciplinary Digital Publishing Institute (MDPI)
Nanomaterials
2024#14Issue 13
As one of the most promising photovoltaic technologies, perovskite solar cells (PSCs) exhibit high absorption coefficients, tunable bandgaps, large carrier mobilities, and versatile fabrication techniques. Nevertheless, the commercialization of the technology is hindered by poor material stability, short device lifetimes and the scalability of fabrication techniques. To address these technological drawbacks, various strategies have been explored, with one particularly promising approach involving the formation of a low-dimensional layer on the surface of the three-dimensional perovskite film. In this work, we demonstrate the use of guanidinium tetrafluoroborate, CH6BF4N3, (GATFB) as a post-treatment step to enhance the performance of PSCs. Compared with the control sample, the application of GATFB improves the film surface topology, reduces surface defects, suppresses non-radiative recombination, and optimizes band alignment within the device. These positive effects reduce recombination losses and enhance charge transport in the device, resulting in PSCs with an open-circuit voltage (VOC) of 1.18 V and a power conversion efficiency (PCE) of 19.7%. The results obtained in this work exhibit the potential of integrating low-dimensional structures in PSCs as an effective approach to enhance the overall device performance, providing useful information for further advancement in this rapidly evolving field of photovoltaic technology.
dimensional engineering , interface engineering , perovskites , solar cells
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Department of Electrical and Computer Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 7098 Liuxian Boulevard, Shenzhen, 518055, China
National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Electrical and Computer Engineering
Hoffmann Institute of Advanced Materials
National Laboratory Astana
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