Presentation Details
| High-specific-power photovoltaics from stacked CVD-grown MoS2 Muhammad A.Abbas, Timothy Ismael, Teethiya Datta, Josh M.Sasson, Owen P.Harris, Miriam E.Lerner, Matthew D.Escarra. Tulane University, New Orleans, LA, USA |
Abstract
Abstract — High-specific-power photovoltaics are desirable for space and other volume or weight constrained applications. Two-dimensional (2D) transition metal dichalcogenides (TMDCs) such as MX2, including MoS2 and WSe2, are ideal for flexible, ultra-light photovoltaics. A single layer of MoS2 can absorb up to 10% of light in the visible and near-infrared spectrum, with a thickness of just 0.65 nm and a direct bandgap of 1.85 eV in monolayer form, whereas bulk MoS2 shifts toward becoming an indirect bandgap semiconductor. Here, we present high-specific-power photovoltaic cells with a stacked, vertical architecture, using platinum with a work function of 5.5 eV as the bottom contact and indium tin oxide (ITO) with a work function of 4.5 eV as the top contact. Scalable MoS2 monolayers are stacked on top of platinum contacts to maintain a direct bandgap while improving absorption and other optoelectronic properties. Device simulations indicate a power conversion efficiency of approximately 1.25% under 1 sun illumination with ten monolayers of MoS2. Key properties have been experimentally validated, and full device fabrication is underway. Solar arrays from these materials are expected to have one to two orders of magnitude improvement in specific power relative to existing space solar arrays. Keywords—Schottky solar cells, 2D materials, chemical vapor deposition, high-specific-power photovoltaics, space solar power
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