Zn(O,S) Buffer Layer for in Situ Hydrothermal Sb2S3 Planar Solar Cells
- 14 September 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 13 (38), 45726-45735
- https://doi.org/10.1021/acsami.1c12501
Abstract
Hydrothermal deposition is emerging as a highly potential route for antimony-based solar cells, in which the Sb-2(S,Se)(3) is typically in situ grown on a common toxic CdS buffer layer. The narrow band gap of CdS causes a considerable absorption in the short-wavelength region and then lowers the current density of the device. Herein, TiO2 is first evaluated as an alternative Cdfree buffer layer for hydrothermally derived Sb2S3 solar cells. But it suffers from a severely inhomogeneous Sb2S3 coverage, which is effectively eliminated by inserting a Zn(O,S) layer. The surface atom of sulfur in Zn(O,S) uniquely provides a chemical bridge to enable the quasi-epitaxial deposition of Sb2S3 thin film, confirming by both morphology and binding energy analysis using DFT. Then the results of the first-principles calculations also show that Zn(O,S)/Sb2S3 has a more stable structure than TiO2/Sb2S3. The resultant perfect Zn(O,S)/Sb2S3 junction, with a suitable band alignment and excellent interface contact, delivers a remarkably enhanced JSC and VOC for Sb2S3 solar cells. The device efficiency with the TiO2/Zn(O,S) buffer layer boosts from 0.54% to 3.70% compared with the counterpart of TiO2, which has a champion efficiency of Cd-free Sb2S3 solar cells with a structure of ITO/TiO2/Zn(O,S)/Sb2S3/Carbon/Ag by in situ hydrothermal deposition. This work provides a guideline for the hydrothermal deposition of antimony-based films upon a nontoxic buffer layer.Keywords
Funding Information
- Ministry of Education of the People's Republic of China (2042021kf0069)
- Natural Science Foundation of Fujian Province (2020J02018)
- National Natural Science Foundation of China (11874113, 61974028)
- Fujian Normal University (2019140, 2019143, cxxl-2019135)
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage (SECES2007)
This publication has 38 references indexed in Scilit:
- Efficient planar Sb2S3 solar cells using a low-temperature solution-processed tin oxide electron conductorPhysical Chemistry Chemical Physics, 2016
- Highly Improved Sb2S3 Sensitized‐Inorganic–Organic Heterojunction Solar Cells and Quantification of Traps by Deep‐Level Transient SpectroscopyAdvanced Functional Materials, 2014
- Antimony sulfide thin films in chemically deposited thin film photovoltaic cellsThin Solid Films, 2007
- Structural properties and bandgap bowing of ZnO1−xSx thin films deposited by reactive sputteringApplied Physics Letters, 2004
- Generalized Gradient Approximation Made SimplePhysical Review Letters, 1996
- Efficient iterative schemes forab initiototal-energy calculations using a plane-wave basis setPhysical Review B, 1996
- Projector augmented-wave methodPhysical Review B, 1994
- Ab initiomolecular dynamics for open-shell transition metalsPhysical Review B, 1993
- Optical Second-Harmonic Generation in ZnS—CdS and CdS—CdSe AlloysJournal of Applied Physics, 1964
- The exciton spectrum of zinc oxideJournal of Physics and Chemistry of Solids, 1960