Publication date: 5th November 2025
Perovskite solar cells (PSCs) have attracted much attention due to their high-energy conversion efficiency and low production cost. However, the issue of stability is still remained. Our group focuses on the fundamental studies of PSCs, including development of materials for compact layer, active layer, and back electrode, as well as interface passivation of PSCs.
The simple process by using several small organic and inorganic molecules for interface passivation of devices. We successfully fabricated seamless interfacial contact carbon electrodes for low-cost PSCs through hot-pressing and solution passivation methods. The resulting PSCs with carbon electrodes exhibit excellent PCEs. The devices also show good stability than the conventional devices.
We also using interface engineering strategy by passivating with 4-nitrophenyl phosphate (PNNP) for [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) to improve the NiOx/perovskite (PVK) interface. This technique enhanced the surface uniformity and hydrophilic nature of the NiOx/Me-4PACz, while promoting favorable growth of PVK crystal orientation. Furthermore, the PNNP effectively mitigates the generation of defects at the NiOx surface and the underlying PVK, ultimately significantly improving the interfacial charge transfer efficiency. Consequently, efficiency of F-PSCs rose from 21.46% to 23.66%. Due to better stress distribution within the PVK and stronger adhesion at the NiOx/PVK boundary, the F-PSCs retained 80% of their original efficiency even after undergoing 10000 bending cycles.Notably, PNNP exhibited an outstanding capacity to capture PbI2, contributing to the device's potential for reducing lead leakage under operational conditions.
I will also introduce our group other interface passivation research results of perovskite solar cells.
This work was supported by funding from Kakehi, Japan.
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