Suns- V<inf>OC</inf> characteristics of high performance kesterite solar cells
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Low open circuit voltage (VOC) has been recognized as the number one problem in the current generation of Cu2ZnSn(Se,S)4 (CZTSSe) solar cells. We report high light intensity and low temperature Suns-VOC measurement in high performance CZTSSe devices. The Suns-VOC curves exhibit bending at high light intensity, which points to several prospective VOC limiting mechanisms that could impact the VOC, even at 1 sun for lower performing samples. These V OC limiting mechanisms include low bulk conductivity (because of low hole density or low mobility), bulk or interface defects, including tail states, and a non-ohmic back contact for low carrier density CZTSSe. The non-ohmic back contact problem can be detected by Suns-VOC measurements with different monochromatic illuminations. These limiting factors may also contribute to an artificially lower JSC-VOC diode ideality factor. © 2014 AIP Publishing LLC.
Published Version (Please cite this version)10.1063/1.4893315
Publication InfoGunawan, O; Gokmen, T; & Mitzi, DB (2014). Suns- V<inf>OC</inf> characteristics of high performance kesterite solar cells. Journal of Applied Physics, 116(8). 10.1063/1.4893315. Retrieved from https://hdl.handle.net/10161/9180.
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Simon Family Distinguished Professor
David Mitzi received his B.S. in Electrical Engineering and Engineering Physics from Princeton University in 1985 and his Ph.D. in Applied Physics from Stanford University in 1990. Prior to joining the faculty at Duke in 2014, Dr. Mitzi spent 23 years at IBM’s T.J. Watson Research Center, where his focus was on the search for and application of new electronic materials, including organic-inorganic perovskites and inorganic materials for photovoltaic, LED, transistor and memory app