Proceedings of Asia-Pacific Conference on Perovskite, Organic Photovoltaics&Optoelectronics (IPEROP25)
Publication date: 17th October 2024
A low-dimensional perovskite layer is crucial as a passivation layer for 3D perovskite solar cells to improve their performance and stability. This study presents a mixed 2D cation passivation technique using n-butylammonium iodide (BAI) and n-octylammonium iodide (OAI), which enhances the durability and opto-electronic properties of the solar cells. 2D perovskite has been introduced as an excellent surface passivator for the 3D perovskite layer due to the stable crystal structure and hydrophobicity, which improved the stability of the perovskite solar cells. Those low dimensional crystal consists of metal halide octahedra separated by the larger organic cations so-called spacers, which can be classified as Ruddlesden popper (A′)2(A)n−1PbnX3n+1, Dion-Jacobson (A″)(A)n−1PbnX3n+1, and alternating cations (B)(A)nPbnX3n+1 phase metal halide perovskite crystal. The research also reveals that under light irradiation and high-temperature conditions, the 2D perovskite migrates into the 3D layer, leading to a reduction in photovoltaic performance. We revealed the impact of the cation migration, which is the disappearance of the 2D perovskite passivation layer by exposing to light and high temperature, resulting in the decrease of the photovoltaic parameters of the perovskite solar cells. Notably, although 2D perovskite layer disappeared from the 3D perovskite layer by light irradiation, the solar cells with 2D passivation showed better stability than without passivation. In particular, delta phase perovskite, which is harmful to stability, was efficiently reduced by BAI-OAI passivation. This finding emphasizes the importance of controlling cation migration in designing stable 2D/3D perovskite systems for solar cells.[1]
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International Conference on Hybrid and Organic Photovoltaics
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Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
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