Luminescent solar concentrator modules fabricated from near- infrared Cu-doped InP/Zn-Cu-In-S/ZnS quantum dots with thicker mid-shell for high absorptivity Jiyong Kim 1 , Kyoungwon Park 2 , Fabian Loepthien 1 , Yohan Kim 1 , Lucas G.P Tienne 3 , Manuel Gensler 1 and Armin Wedel 1 1 Fraunhofer-Institut für Angewandte Polymerforschung (IAP), Germany 2 Display Research Center Korea Electronics Technology Institute Seongnam-si, Korea 3 Department of Materials Science and Engineering, Federal University of Rio de Janeiro, Brazil Luminescent solar concentrators (LSCs) can be considered cost-effective large-area sunlight collectors for space-based photovoltaics, which can realize applicable devices as a window in real life. Also, the LSC module does not require a specific space to be installed differently from silicon-based solar cells; thus, it can contribute to many applications such as car windows, electronic devices, fiber optics, and photon transport for passive daylighting. 1-2 Mostly, LSCs are composed of transparent materials with highly emissive fluorophores, which are then sandwiched by glass panels. Thus, sunlight emits photons of fluorophores on a large-area device face, and their emitted photons are then waveguided by total internal reflection to the device edge, where they all are collected by photovoltaic cells. 3 Herein, we applied highly emissive near-infrared (NIR) InP:Cu/Zn-Cu-In-S/ZnS core/shell/shell quantum dots (QDs) with exceptional photoluminescence quantum efficiencies (PLQYs) up to 82.4% for LSC modules, where the QDs with different thickness of Zn-Cu-In-S mid-shell are applied to enhance edge-waveguided emissions related to their efficiency in devices. As a result, the Cu-doped InP QDs with the thicker mid-shell show the maximum external quantum efficiency (EQE) of over 14% when exposed to blue LED light. With increasing mid-shell thickness, EQE of LSC modules exhibits an increasing trend due to their enhanced light-absorptivity, which directly indicates that the optical properties of QD material are significant factors in fabricating LSCs. These outcomes strongly point to the efficacy of the ZCIS interlayer in the LCS modules with Cu-doped InP QDs, which enhances not only the PL QYs and absorptivity of QDs via the alleviation of core/shell interfacial strain effectively but also the EQE of LSCs. References 1. Debije, M. G.; Verbunt, P. P. C., Thirty Years of Luminescent Solar Concentrator Research: Solar Energy for the Built Environment. Advanced Energy Materials 2012 , 2 (1), 12-35. 2. Earp, A. A.; Smith, G. B.; Franklin, J.; Swift, P., Optimisation of a three-colour luminescent solar concentrator daylighting system. Solar Energy Materials and Solar Cells 2004 , 84 (1-4), 411-426. 3. Bradshaw, L. R.; Knowles, K. E.; McDowall, S.; Gamelin, D. R., Nanocrystals for luminescent solar concentrators. Nano letters 2015 , 15 (2), 1315-1323.
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