Various halide perovskite crystals based on CH3NH3PbI3 (abbreviated MAPbI3) are expected to become next-generation solar cell materials and are currently undergoing research and development worldwide. However, despite its high photoelectric conversion efficiency, MAPbI3 has an unstable structure due to the presence of CH3NH3 (MA) organic molecules, and the decomposition of CH3NH3 from CH3NH3PbI3 in the atmosphere results in the formation of PbI2. The expensive 2,2',7,7'-tetrakis (N,N-di-p-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) is widely used throughout the world as a hole transport material in perovskite solar cells. To enhance hole transport, spiro-OMeTAD needs dopants such as lithium bis(trifluoromethane sulfonyl) imide and 4-tert-butylpyridine, which are highly hygroscopic and accelerate degradation of the perovskite layer when moisture is absorbed. Therefore, it is necessary to find alternative hole transport materials. In this study, decaphenylcyclopentasilane (DPPS) was selected as a material to modify the perovskite surface, and fabrication of perovskite photovoltaic devices in air and under unsealed conditions was attempted. DPPS is stable in air at temperatures up to 300°C and has the potential to suppress MA desorption; additionally,high-temperature heat treatment can form dense cubic perovskite, which is a stable phase at high temperatures. Polysilane has also been reported to function as a hole transport material, and is also expected to improve photoelectric conversion properties by using the DPPS as a hole transport layer. The fabrication of perovskite photovoltaic devices with DPPS by the air blow method in air could greatly simplify the manufacturing process without using a glove box and stabilize the solar cell characteristics.
Previous Article in event
Next Article in event
Fabrication and characterization of DPPS-introduced perovskite solar cells
Published:
16 May 2025
by MDPI
in 4th Coatings and Interfaces Online Conference
session Coatings and Thin Film Deposition
Abstract:
Keywords: Perovskite solar cell; Hole transport layer; Decaphenylcyclopentasilane
