BPN891: Dopant-Free Asymmetric Heterocontact Silicon Solar Cells with >20% Efficiency


A salient characteristic of solar cells is their ability to subject photo-generated electrons and holes to pathways of asymmetrical conductivity—‘assisting’ them towards their respective contacts. All commercially available crystalline silicon (c-Si) solar cells achieve this by making use of doping in either near-surface regions or overlying silicon-based films. Despite being commonplace, this approach is hindered by several optoelectronic losses and technological limitations specific to doped silicon. A progressive approach to circumvent these issues involves the replacement of doped-silicon contacts with alternative materials which can also form ‘carrier- selective’ interfaces on c-Si. Here we successfully develop and implement dopant-free electron and hole carrier- selective heterocontacts using alkali metal fluorides and metal oxides, resulting in power conversion efficiencies of 20%.

Project end date: 02/19/19

Publication date: 
January 28, 2019
Publication type: 
BSAC Project Materials (Final/Archive)
PREPUBLICATION DATA - ©University of California 2019

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