Journal
CARBON
Volume 57, Issue -, Pages 329-337Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.01.080
Keywords
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Funding
- Northeastern University
- NSF [ECCS-1202376]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1202376] Funding Source: National Science Foundation
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We investigated heterojunctions of Si with large-area high-quality monolayer and multilayer graphene, as well as thin transparent graphite. We show that by controlling the transmittance and sheet resistance of large-area graphitic electrodes, it is possible to obtain solar cells with power conversion efficiency (PCE) exceeding 3% without any doping requirements. Our calculations indicate that such junctions can form extremely robust interfaces with near-100% internal quantum efficiency. Under optimized doping conditions, power conversion efficiencies increase almost universally by a factor of 2.5. Optimized conditions for reproducibly obtaining cells with PCE > 5% are presented, with the best PCE obtained similar to 7.5% with short-circuit current density exceeding 24 mA/cm(2). (c) 2013 Elsevier Ltd. All rights reserved.
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