Photovoltaic performance of CdS/CdTe junctions on ZnO nanorod arrays

Kartopu, G., Turkay, D., Ozcan, C., Hadibrata, W., Aurang, P., Yerci, S., Unalan, H. E., Barrioz, Vincent, Qu, Yongtao, Bowen, L., Gürlek, A.K., Maiello, Pietro, Turan, R. and Irvine, Stuart (2018) Photovoltaic performance of CdS/CdTe junctions on ZnO nanorod arrays. Solar Energy Materials and Solar Cells, 176. pp. 100-108. ISSN 0927-0248

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One-dimensional nanostructures, such as nanorod (NR) arrays, are expected to improve the photovoltaic (PV) response of solar cells with an ultrathin absorber due to an increased areal (junction) density and light trapping. We report on the deposition of CdS and CdTe:As semiconductor thin films on ZnO NR arrays by means of metalorganic chemical vapour deposition (MOCVD). The change in optical properties of the ZnO NRs upon the growth of CdS shell was monitored and compared to the simulated data, which confirmed the presence of strong light scattering effects in the visible and near infrared regions. The PV performance of nanostructured vs. planar CdS/CdTe solar cells (grown using the material from the same MOCVD run) showed similar conversion efficiencies (~ 4%), despite the current density being lower for the nanostructured cell due to its thicker CdS window. A clear improvement in the quantum efficiency was however observed in the near infrared region, resulting from the light trapping by the ZnO/CdS core-shell NR structure. We also showed that reduction of surface defects and use of high absorber carrier density would boost the efficiency beyond that of planar CdTe solar cells. The reported device performance and the direct observation of light trapping are promising towards optimisation of extremely-thin-absorber CdTe PV devices.

Item Type: Article
Additional Information: Funding information: Funding provided by TUBITAK-British Council through the bilateral project DETACELL (Grant no. 115F518) is gratefully acknowledged. Authors would like to thank O. Yılmaz for ZnO seed layer deposition by sputtering.
Uncontrolled Keywords: ZnO nanorods, CdS/CdTe thin film photovoltaics, MOCVD, Light trapping
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 30 Apr 2018 14:53
Last Modified: 19 May 2022 12:25

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