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Title: | Thermal stability improvement of metal oxide-based contacts for silicon heterojunction solar cells | Authors: | Cho, Jinyoun Radhakrishnan, Hariharsudan Sivaramakrishnan SHARMA, Rajiv Payo, Maria Recaman Debucquoy, Maarten VAN DER HEIDE, Arvid GORDON, Ivan Szlufcik, Jozef POORTMANS, Jef |
Issue Date: | 2020 | Publisher: | ELSEVIER | Source: | SOLAR ENERGY MATERIALS AND SOLAR CELLS, 206 (Art N° 110324) | Abstract: | Metal oxides are interesting materials for use as carrier-selective contacts for the fabrication of doping-free silicon solar cells. In particular, MoOx and TiOx have been successfully used as hole and electron selective contacts in silicon solar cells, respectively. However, it is of paramount importance that good thermal stability is achieved in such contacts. In our work, we combined i-a-Si:H/MoOx based hole contacts with electron contacts featuring i-a-Si:H/TiOx/low work function metal (ATOM) to fabricate doping-free cells, termed MoIyATOM cells. We found that the thermal stability of the ATOM contact was improved when the i-a-Si:H was annealed (300 degrees C for 20 min in N-2) before depositing TiOx (Le. pre-TiOx annealing), which reduces the hydrogen content in i-a-Si:H by about 27 Vorei, and thereby the H-related degradation of the ATOM contact characteristics. Moreover, it was found that reducing the thickness of the low-work function metal on top of the TiOx enhanced the thermal stability of the ATOM contact. With these adaptations, the MoIyATOM cell efficiency was improved by 3.5 %(abs), with the highest efficiency of 17.6%. Moreover, the cells show improved thermal stability after the above-mentioned pre-TiOx annealing, which is confirmed by annealing tests at cell level as well as damp-heat tests at module level. The insights of this study could be used to tailor other metal-oxide based electron or hole contacts. | Notes: | Cho, JY (reprint author), Katholieke Univ Leuven, ESAT Dept, Kasteelpk Arenberg 10, B-3001 Leuven, Belgium.; Radhakrishnan, HS (reprint author), IMEC, Kapeldreef 75, B-3001 Leuven, Belgium.; Cho, JY (reprint author), Umicore, Watertorenstr 33, B-2250 Olen, Belgium. jinyoun.cho@eu.umicore.be |
Other: | Cho, JY (reprint author), Katholieke Univ Leuven, ESAT Dept, Kasteelpk Arenberg 10, B-3001 Leuven, Belgium; Umicore, Watertorenstr 33, B-2250 Olen, Belgium. Radhakrishnan, HS (reprint author), IMEC, Kapeldreef 75, B-3001 Leuven, Belgium. jinyoun.cho@eu.umicore.be | Keywords: | Doping-free tells;Passivating contact;TiOx;MoOx;Thermal stability;Annealing | Document URI: | http://hdl.handle.net/1942/31120 | ISSN: | 0927-0248 | e-ISSN: | 1879-3398 | DOI: | 10.1016/j.solmat.2019.110324 | ISI #: | WOS:000519653800055 | Rights: | 2019 Elsevier B.V. All rights reserved. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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Thermal stability improvement of metal oxide based contacts for silicon heterojunction solar cells.pdf | Peer-reviewed author version | 1.57 MB | Adobe PDF | View/Open |
Thermal_stability.pdf Restricted Access | Published version | 2.34 MB | Adobe PDF | View/Open Request a copy |
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