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Titanium dioxide/silicon hole-blocking selective contact to enable double-heterojunction crystalline silicon-based solar cell

Author(s): Man, Gabriel; Jhaveri, Janam; Wagner, Sigurd W.; Sturm, James C.; Nagamatsu, Ken A.; et al

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Abstract: In this work, we use an electron-selective titanium dioxide (TiO2) heterojunction contact to silicon to block minority carrier holes in the silicon from recombining at the cathode contact of a silicon-based photovoltaic device. We present four pieces of evidence demonstrating the beneficial effect of adding the TiO2 hole-blocking layer: reduced dark current, increased open circuit voltage (VOC), increased quantum efficiency at longer wavelengths, and increased stored minority carrier charge under forward bias. The importance of a low rate of recombination of minority carriers at the Si/TiO2 interface for effective blocking of minority carriers is quantitatively described. The anode is made of a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) heterojunction to silicon which forms a hole selective contact, so that the entire device is made at a maximum temperature of 100?°C, with no doping gradients or junctions in the silicon. A low rate of recombination of minority carriers at the Si/TiO2 interface is crucial for effective blocking of minority carriers. Such a pair of complementary carrier-selective heterojunctions offers a path towards high-efficiency silicon solar cells using relatively simple and near-room temperature fabrication techniques. © 2015 AIP Publishing LLC.
Publication Date: 23-Mar-2015
Electronic Publication Date: 26-Mar-2015
Citation: Nagamatsu, K.A., Avasthi, S., Sahasrabudhe, G., Man, G., Jhaveri, J., Berg, A.H., Schwartz, J., Kahn, A., Wagner, S., Sturm, J.C. (2015). Titanium dioxide/silicon hole-blocking selective contact to enable double-heterojunction crystalline silicon-based solar cell. Applied Physics Letters, 106 (10.1063/1.4916540
DOI: doi:10.1063/1.4916540
Pages: 106.12:123906-1 - 123906-6
Type of Material: Journal Article
Journal/Proceeding Title: Applied Physics Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Applied Physics Letters. Volume 106, Issue 12, 23 March 2015, Article number 123906.



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