2D/3D crystal growth engineering for inorganic CsPbI2Br perovskite solar cells under processed in ambient air
Jitendra Bahadur a, Seojun Lee b, Jun Ryu b, Dong-Won Kang a b
a School of Energy Systems Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea
b Department of Smart City, Chung-Ang University, Seoul, 06974, Republic of Korea
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Poster, Dong-Won Kang, 079
Publication date: 21st November 2022

All-inorganic mixed halide based CsPbI2Br (CPIB) perovskite achieved massive attention due to its unique properties such as favorable band gap (~ 1.91 eV) and thermal stability, as well as low cost of raw materials and solution processability, leading to promising candidate to use as a top cell (front sub-cell) in the fabrication of tandem solar cells (TSCs). Unfortunately, conventional one-step solution processed CPIB film under ambient conditions, suffers from unsatisfactory crystallization, heterogeneous crystal growth and rough surface, which limits the device performance and its future applications. Therefore, it is urgent to prepare high crystalline CPIB film with uniform and compact morphology for development of efficient and stable device fabrication under ambient conditions. We opted additive strategy to fabricate the PSCs, because inorganic perovskite easily interacts with other function groups (covalent and ionic) contain precursors, due to its ionic-covalent feature. Moreover, additives play a vital role to modulate the crystallization kinetics by accelerating the nucleation and retard the crystallization process.  

In the present work, we fabricated a high-quality CPIB perovskite film under ambient atmospheric conditions by firstly introducing PEAI as an additive into the perovskite precursor solution. Interestingly, an optimum concentration of PEAI controls the chemical reaction between CsI-PEAI-DMSO:DMF-PbX2 and retards the crystallization kinetics, resulting in Ostwald ripening, producing large grains, and reducing pinholes. The prolonged crystallization time with the PEAI additive is beneficial for improving film quality. Herein, we have performed systematic investigation to identify the impact of PEAI additives on microstructural and optoelectronic properties of CPIB, and its device performance. Notably, we have found PEAI generate favourable impact on film properties and device performance under indoor/outdoor lighting conditions.

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF - 2021R1A2C4002045, 2021R1A4A2001687, 2021K2A9A2A08000082 and 2022H1D3A2A01096254).

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