Journal
ACS COMBINATORIAL SCIENCE
Volume 18, Issue 9, Pages 583-589Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscombsci.6b00074
Keywords
buffer layer; CIGSe; CZTSe; current-voltage characteristics; external quantum efficiency; solar cells
Funding
- Solar Energy Research Institute for India
- U.S. (SERIIUS) - U.S. Department of Energy (Office of Science) [DE AC36-08G028308]
- U.S. (SERIIUS) - U.S. Department of Energy (Office of Basic Energy Sciences) [DE AC36-08G028308]
- U.S. (SERIIUS) - U.S. Department of Energy (Energy Efficiency and Renewable Energy, Solar Energy Technology Program) [DE AC36-08G028308]
- U.S. (SERIIUS) - U.S. Department of Energy (Office of International Affairs) [DE AC36-08G028308]
- Government of India [IUSSTF/JCERDC-SERIIUS/2012]
- MAGEEP SERIIUS visiting scholars program
- Sao Paulo Research Foundation (FAPESP) [2014/12166-3]
- Department of Defense through the National Defense Science and Engineering Graduate Fellowship Program
- US Department of Energy, Office of Energy Efficiency and Renewable Energy
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Contact layers play an important role in thin film solar cells, but new material development and optimization of its thickness is usually a long and tedious process. A high-throughput experimental approach has been used to accelerate the rate of research in photovoltaic (PV) light absorbers and transparent conductive electrodes, however the combinatorial research on contact layers is less common. Here, we report on the chemical bath deposition (CBD) of CdS thin films by combinatorial dip coating technique and apply these contact layers to Cu(In,Ga)Se-2 (CIGSe) and Cu2ZnSnSe4 (CZTSe) light absorbers in PV devices. Combinatorial thickness steps of CdS thin films were achieved by removal of the substrate from the chemical bath, at regular intervals of time, and in equal distance increments. The trends in the photoconversion efficiency and in the spectral response of the PV devices as a function of thickness of CdS contacts were explained with the help of optical and morphological characterization of the CdS thin films. The maximum PV efficiency achieved for the combinatorial dip-coating CBD was similar to that for the PV devices processed using conventional CBD. The results of this study lead to the conclusion that combinatorial dip-coating can be used to accelerate the optimization of PV device performance of CdS and other candidate contact layers for a wide range of emerging absorbers.
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