Corpus-Mendoza, A.N., De Souza, M.M. orcid.org/0000-0002-7804-7154 and Hamelmann, F.U. (2015) Design of Schottky Contacts for Optimum Performance of Thin-Film Silicon Solar Cells. IEEE Journal of Photovoltaics, 5 (1). pp. 22-27. ISSN 2156-3381
Abstract
A full-scale model combining TCAD simulations with circuit modeling of p-type window layers in thin-film silicon solar cells is validated by experiment. The results demonstrate that Schottky contacts with a barrier height greater than 0.5 eV cause a kink in the simulated J-V characteristics that represents a considerable reduction of the open-circuit voltage when thermionic emission is the dominant transport mechanism. An optimum cell can be designed by facilitating tunneling mechanism through the Schottky barrier via an adjustment of the doping concentration of the semiconductor or by introducing thin μc-Si:H(p) in order to lower the barrier height between ZnO and a-Si:H(p). In such a case, however, the narrower bandgap of μc-Si:H compared with that of a-Si:H, and the misalignment of the energy bands between μc-Si:H(p) and a-Si:H(i), also compromise the short-circuit current and open-circuit voltage of the cell, respectively. Optimum interfaces for our 15-nm window layer are found when a combined μc-Si:H(p)/a-Si:H(p) with a 4/11-nm thickness ratio is used. A general circuit model for solar cells that accounts for the effects of nonohmic contacts is demonstrated. The ideality factor “n2 ” of the Schottky junction of the contact indicates the transport mechanism at the interface with values less than 0.5 eV having no impact on the cell performance.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Amorphous silicon; Schottky diode; thin-film solar cells; tunneling transport |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 23 Aug 2018 14:33 |
Last Modified: | 23 Aug 2018 14:33 |
Published Version: | https://doi.org/10.1109/JPHOTOV.2014.2362306 |
Status: | Published |
Publisher: | IEEE |
Refereed: | Yes |
Identification Number: | 10.1109/JPHOTOV.2014.2362306 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132830 |