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Efficient Solar Cells Employing Light‐Harvesting Sb 0.67 Bi 0.33 SI
Author(s) -
Nie Riming,
Im Jino,
Seok Sang Il
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201808344
Subject(s) - materials science , energy conversion efficiency , band gap , solar cell , chemical bath deposition , chemical engineering , photocurrent , optoelectronics , engineering
Sb 1− x Bi x SI, an isostructural material with the well‐known quasi‐1D SbSI, possesses good semiconductive and ferroelectric properties but is not applied in solar cells. Herein, solar cells based on alloyed Sb 0.67 Bi 0.33 SI (ASBSI) as a light harvester are fabricated. ASBSI is prepared through the reaction of bismuth triiodide in N , N ‐dimethylformamide solution with an antimony trisulfide film deposited on a mesoporous (mp)‐TiO 2 electrode via chemical bath deposition at 250 °C under an argon or nitrogen atmosphere; the alloy exhibits a promising bandgap (1.62 eV). The best performing cell fabricated with poly[2,6‐(4,4‐bis(2‐ethylhexyl)‐4H‐cyclopenta[2,1‐b;3,4‐b′]dithiophene)‐ alt ‐4,7‐(2,1,3‐benzothiadiazole)] as the hole‐transporting layer shows 4.07% in a power conversion efficiency (PCE) under the standard illumination conditions of 100 mW cm −2 . The unencapsulated cells exhibit good comprehensive stability with retention of 92% of zjr initial PCE under ambient conditions of 60% relative humidity over 360 h, 93% after 1 sun illumination for 1254 min, and 92% after storage at 85 °C in air for 360 h.