Surface photovoltage study of perovskite materials and structures for solar cell applications
Résumé
Background:
• Perovskites (PSK) are considered as a perspective material for the 4 th generation solar cells because of their tunable bandgap around 1.6 eV via compositional engineering, high absorption coefficient and steep absorption edge. • The power conversion efficiency of PSK solar cells has grown from 14.1% to 26.1% during the last 10 years (2013-2023) • However, their stability is still a problem due to the degradation of the optoelectronic properties of the PSK light absorber, as well as of the selective carrier transport layers (SCTL) used to selectively extract photogenerated carriers.
A challenge: Understand the carrier generation, transport and recombination in the PSK and at the PSK/SCTL interface and surface.
Fully inorganic lead halide PSK thin films CsPbI 3 and partial solar cell structures 1) electron transport layer TiO 2 deposited on FTO/glass substrates by spray pyrolysis (FTO=fluorine-doped tin oxide) 2) Perovskite -deposited via spin-coating 3) glass sheet a few μm thick to protect the perovskite
The Metal-insulator-semiconductor (MIS) SPV operation mode • chopped light, flux density ~10 13 cm -2 s -1 • SPV = V s light -V s dark