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Highly Improved Sb 2 S 3 Sensitized‐Inorganic–Organic Heterojunction Solar Cells and Quantification of Traps by Deep‐Level Transient Spectroscopy
Author(s) -
Choi Yong Chan,
Lee Dong Uk,
Noh Jun Hong,
Kim Eun Kyu,
Seok Sang Il
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201304238
Subject(s) - materials science , x ray photoelectron spectroscopy , crystallinity , energy conversion efficiency , heterojunction , open circuit voltage , solar cell , spectroscopy , hybrid solar cell , polymer solar cell , analytical chemistry (journal) , optoelectronics , chemical engineering , chemistry , voltage , physics , quantum mechanics , engineering , composite material , chromatography
The light‐harvesting Sb 2 S 3 surface on mesoporous‐TiO 2 in inorganic–organic heterojunction solar cells is sulfurized with thioacetamide (TA). The photovoltaic performances are compared before and after TA treatment, and the state of the Sb 2 S 3 is investigated by X‐ray diffraction, X‐ray photoelectron spectroscopy, and deep‐level transient spectroscopy (DLTS). Although there are no differences in crystallinity and composition, the TA‐treated solar cells exhibit significantly enhanced performance compared to pristine Sb 2 S 3 ‐sensitized solar cells. From DLTS analysis, the performance enhancement is mainly attributed to the extinction of trap sites, which are present at a density of (2–5) × 10 14 cm −3 in Sb 2 S 3 , by TA treatment. Through such a simple treatment, the cell records an overall power conversion efficiency (PCE) of 7.5% through a metal mask under simulated illumination (AM 1.5G, 100 mW cm –2 ) with a very high open circuit voltage of 711.0 mV. This PCE is, thus far, the highest reported for fully solid‐state chalcogenide‐sensitized solar cells.