In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 19 ( 2022), p. 10682-10691
Abstract:
Sn-based perovskite solar cells (PSCs) have shown great advantages as capable alternatives to poisonous Pb-based PSCs, with impressive certified power conversion efficiencies (PCE) beyond 14%. However, their poor stability induced by oxidation has hindered the further development of Sn-based PSCs. Herein, through first-principles calculations, inorganic layered Aurivillius-type Sn-based halide perovskites Ba 2 X 2 [Cs n −1 Sn n X 3 n +1 ] (X = I/Br/Cl) have been designed, in which the [Ba 2 X 2 ] layer blocks the oxygen in air, enhancing the inoxidizability of the crystals. Ba 2 X 2 [Cs n −1 Sn n X 3 n +1 ] exhibit direct band gaps (0.84–2.20 eV), satisfying the requirements for single- and multi-junction PSCs. As the best candidate, Ba 2 Br 2 [Cs 2 Sn 3 Br 10 ] has an optimal band gap (1.26 eV), high carrier mobility (135–173 cm 2 V −1 s −1 ) and desirable absorption coefficient (∼10 5 cm −1 ). Consequently, the optimized single-junction SnO 2 /Ba 2 Br 2 [Cs 2 Sn 3 Br 10 ]/CuSbS 2 shows a record PCE of 27.7% among Sn-based PSCs, beyond the champion PCE of Pb-based PSCs (25.5%). These energetic results provide a new perspective to improve the performance of Sn-based single-junction PSCs and give a potential alternative to bottom/top PSCs in tandem devices.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
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