3 years ago

Silicon solar cells with bifacial metal oxides carrier selective layers

Silicon solar cells with bifacial metal oxides carrier selective layers
Silicon heterojunction (SHJ) solar cells, constructed with hydrogenated amorphous silicon (a-Si:H) carrier-selective layers and a crystalline silicon substrate, are promising alternatives to conventional monocrystalline silicon solar cells. However, the undesirable characteristics like high parasitic light-absorption and low conductivity of the doped a-Si:H carrier limit further improvement of the performance of SHJ solar cells. In our design, MoOx is chosen as the hole-selective layer of the silicon heterojunction solar cell to reduce the parasitic incident-light absorption. In particular, lightly boron-doped zinc oxide (ZnO:B) films with high conductivities and low refractive indices, instead of the common heavily phosphorus-doped a-Si:H (n+-a-Si:H), are directly deposited as electron-selective layers to achieve low resistivity ohmic contact and an excellent optical back-reflectance. Compared to the solar cell based on an n+-a-Si:H electron-selective layer, efficiencies up to 16.6% could be achieved for the cells based on the ZnO:B electron-selective layer, with a relative increase in the efficiency by 15.3%. The results demonstrate that the low-cost ZnO:B electron-selective materials could allow realization of the optical and electrical requirements simultaneously, and also provide an alternative design concept for existing energy conversion devices.

Publisher URL: www.sciencedirect.com/science

DOI: S2211285517304275

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