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2023 Vol.11, Issue 3
Bandgap Engineering in CZTSSe Thin Films via Controlling S/(S+Se) Ratio
Vijay C. Karade12
,
Jun Sung Jang2
,
Kuldeep Singh Gour3
,
Yeonwoo Park1
,
Hyeonwook Park4
,
Jin Hyeok Kim2*
,
Jae Ho Yun1**
1Department of Energy Engineering, Korea Institute of Energy Technology (KENTECH), Naju, 522132, Korea
2Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Korea
3Surface Engineering Group, Advanced Materials & Processes Division, CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India
4Department of Hydrogen Energy, Korea Institute of Energy Technology (KENTECH), Naju, 522132, Korea
*Corresponding Author
**Corresponding Author
30 September 2023. pp. 67-74
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Abstract

The earth-abundant element-based Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells (TFSCs) have attracted greater attention in the photovoltaic (PV) community due to their rapid development in device power conversion efficiency (PCE) >13%. In the present work, we demonstrated the fine-tuning of the bandgap in the CZTSSe TFSCs by altering the sulfur (S) to the selenium (Se) chalcogenide ratio. To achieve this, the CZTSSe absorber layers are fabricated with different S/(S+Se) ratios from 0.02 to 0.08 of their weight percentage. Further compositional, morphological, and optoelectronic properties are studied using various characterization techniques. It is observed that the change in the S/(S+Se) ratios has minimal impact on the overall Cu/(Zn+Sn) composition ratio. In contrast, the S and Se content within the CZTSSe absorber layer gets altered with a change in the S/(S+Se) ratio. It also influences the overall absorber quality and gets worse at higher S/(S+Se). Furthermore, the device performance evaluated for similar CZTSSe TFSCs showed a linear increase and decrease in the open circuit voltage (Voc) and short circuit current density (Jsc) of the device with an increasing S/(S+Se) ratio. The external quantum efficiency (EQE) measured also exhibited a linear blue shift in absorption edge, increasing the bandgap from 1.056 eV to 1.228 eV, respectively.

Keywords
CZTSSe
Thin film solar cells
Bandgap engineering
Kesterite
Doping
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Information
  • Publisher :Korea Photovoltaic Society
  • Publisher(Ko) :한국태양광발전학회
  • Journal Title :Current Photovoltaic Research
  • Volume : 11
  • No :3
  • Pages :67-74
  • Received Date : 2023-07-31
  • Revised Date : 2023-08-27
  • Accepted Date : 2023-08-30
  • DOI :https://doi.org/10.21218/CPR.2023.11.3.067
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