Over 10% efficiency Sb 2 (S,Se) 3 solar cells by enhancing the depletion width and interface passivation via methanol-assisted surface treatment

Methanol-assisted surface etching treatment (SET) improves Sb 2 (S,Se) 3 solar cell performance by expanding the depletion width and passivating interface defects, achieving >10% efficiency and 90% ambient stability after 225 days.