One‐Pot Gram‐Scale,Eco‐Friendly,and Cost‐Effective Synthesis of CuGaS2/ZnS Nanocrystals as Efficient UV‐Harvesting Down‐Converter for Photovoltaics |
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Authors: | Mohammed Jalalah M S Al‐Assiri Jea‐Gun Park |
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Institution: | 1. Department of Electronics and Computer Engineering, Hanyang University, Seoul, Republic of Korea;2. Promising Center for Sensors and Electronic Devices (PCSED), Najran University, Najran, Saudi Arabia |
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Abstract: | It is presented for the first time nontoxic CuGaS2/ZnS quantum dots (QDs) with free‐self‐reabsorption losses and large Stokes shift (>190 nm) synthesized on an industrially gram‐scale as an alternative for Cd‐based energy‐downshift (EDS)‐QD layers. The QDs exhibit a typical EDS that absorbs only UV light (<407 nm) and emits the whole range of visible light (400–800 nm) with a high photoluminescence‐quantum yield of ≈76%. The straightforward application of these EDS‐QDs on the front surface of a monocrystalline p‐type silicon solar cell significantly enhances the short‐circuit current density by ≈1.64 mA cm?2 (+4.20%); thereby, improving the power‐conversion‐efficiency by ≈4.11%. The significant improvement in the external quantum efficiency increases by ≈35.7% and that in the surface reflectance decreases by ≈14.1% in the UV region (300–450 nm) clearly manifest the photovoltaic enhancement. Such promising results together with the simple (one‐pot core/shell synthesis), cost‐effective (reduction in a bill of material–system by ≈2.62%), and scalable (2000 mL three‐neck flask, 11 g of QDs) preparation process might encourage the manufacturers of solar cells and other optoelectronic applications to apply these EDS‐QDs to different broader eco‐friendly applications. |
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Keywords: | CuGaS2/ZnS QDs energy‐downshift quantum dots self‐reabsorption solar cells |
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