Additive-mediated formation of large perovskite grains for efficient organometallic solar cells
Thanh-Danh Nguyen a, Sun-Ju Kim a, Ji-Youn Seo a
a Laboratory of Nano Energy Harvesting Materials and Devices, Department of Nano Fusion Technology, Pusan National University, Pusan, Korea
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Poster, Thanh-Danh Nguyen, 083
Publication date: 18th October 2023

There are various methods to improve the power conversion efficiency (PCE) of perovskite solar cells, in which additive engineering is a representative method to enhance the PCE by controlling the morphology, grain boundary, grain size, and density of defect states in the perovskite layer. We used a functional analog of methylammonium iodide as an additive to increase the grain boundary and grain size, it also passive the uncoordinated Pb2+ on the perovskite surface and grain boundaries. In the optimized sample with an additive, improved PCE of 20.5% (18.7% for the pristine sample) was successively demonstrated. In addition, the remnant anion of analog was identified at the perovskite grain boundaries evidenced by results of time-resolved photoluminescence, in situ X-ray diffraction, and in situ UV-Visible spectroscopy measurements. Temperature dependence behaviors of the additive provide an in-depth understanding of designing and selecting additives to increase the PCE and stability of the perovskite solar cells.

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