Abstract
Antimony sulfide solar cells have demonstrated an efficiency exceeding 7% when assembled in an extremely thin absorber configuration deposited via chemical bath deposition. More recently, less complex, planar geometries were obtained from simple spin-coating approaches, but the device efficiency still lags behind. We compare two processing routes based on different precursors reported in the literature. By studying the film morphology, sub-bandgap absorption and solar cell performance, improved annealing procedures are found and the crystallization temperature is shown to be critical. In order to determine the optimized processing conditions, the role of the polymeric hole transport material is discussed. The efficiency of our best solar cells exceeds previous reports for each processing route, and our champion device displays one of the highest efficiencies reported for planar antimony sulfide solar cells.
Highlights
Antimony sulfide (Sb2S3) is a promising high band gap light absorber for solar cells [1,2,3,4,5]
Antimony sulfide solar cells have demonstrated an efficiency exceeding 7% when assembled in an extremely thin absorber configuration deposited via chemical bath deposition
For the case of Sb-TU it was shown that stoichiometric crystalline Sb2S3 with an S/Sb ratio of 3/2 = 1.5 in the resulting film, which showed the best performance in an extremely thin absorber (ETA) solar cell, requires this initial excess of sulfur in the precursor (SbCl3/TU = 1.8) [29]
Summary
Antimony sulfide (Sb2S3) is a promising high band gap light absorber for solar cells [1,2,3,4,5]. By studying the film morphology, sub-bandgap absorption and solar cell performance, improved annealing procedures are found and the crystallization temperature is shown to be critical.
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