Processing CdS- and CdSe-containing window layers for CdTe solar cells
- 12 February 2021
- journal article
- research article
- Published by IOP Publishing in Journal of Physics D: Applied Physics
- Vol. 54 (21), 215103
- https://doi.org/10.1088/1361-6463/abe5de
Abstract
Influence of heat treatment steps on the characteristics of (CdS,CdSe) junction partners and on solar cell performance were studied. CdS films were obtained by chemical bath deposition, CdSe layers were evaporated. Structural and compositional properties of CdS/CdSe bilayer stacks did not change upon heat treatment at 400 C up to 10 minutes, whereas heat treatment in presence of CdCl2 for 10 minutes caused formation of a CdSSe alloy with a bandgap value of about 2.05 eV. Originally cubic structure of the stack was also transformed into hexagonal during this treatment. CdSe-CdTe interdiffusion was also studied using CdS/CdSe/CdTe triple layer stacks. CdTe films were deposited by close spaced sublimation method. Limited CdSe-CdTe interdiffusion was seen when CdTe was deposited over the as-deposited CdSe layer at 580C. However, such interdiffusion was not detected for samples where CdTe deposition was carried out on CdS/CdSe stacks pre-annealed in presence of CdCl2. This suggests that partial crystallization of CdS/CdSe bilayer stack by CdCl2 reduced such interaction. Solar cells with CdSe/CdTe, CdS/CdTe and CdS/CdSe/CdTe structures with efficiencies of 8.39%, 10.12% and 11.47% were fabricated using 4.5-5 µm thick CdTe layers and a final CdCl2 treatment. Quantum efficiency measurements demonstrated the benefit of CdSe-CdTe alloying during the final CdCl2 treatment in improving the short circuit current values.Keywords
Funding Information
- Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (118F140)
This publication has 22 references indexed in Scilit:
- Solar cell efficiency tables (version 54)Progress In Photovoltaics, 2019
- Effect of CdCl2 passivation treatment on microstructure and performance of CdSeTe/CdTe thin-film photovoltaic devicesSolar Energy Materials and Solar Cells, 2018
- Synthesis and characterization of novel oxygenated CdSe window layer for CdTe thin film solar cellsMaterials Science in Semiconductor Processing, 2017
- CdTe solar cells with open-circuit voltage breaking the 1 V barrierNature Energy, 2016
- Current Enhancement of CdTe-Based Solar CellsIEEE Journal of Photovoltaics, 2015
- Enhancing the photo-currents of CdTe thin-film solar cells in both short and long wavelength regionsApplied Physics Letters, 2014
- Brief review of cadmium telluride-based photovoltaic technologiesJournal of Photonics for Energy, 2014
- Nanostructured CdS:O film: preparation, properties, and applicationphysica status solidi (c), 2004
- Cadmium Telluride Solar CellsPublished by Wiley ,2003
- PROCESSING HIGH EFFICIENCY CdTe SOLAR CELLSInternational Journal of Solar Energy, 1992