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Stretchable and colorless freestanding microwire arrays for transparent solar cells with flexibility

Title
Stretchable and colorless freestanding microwire arrays for transparent solar cells with flexibility
Authors
Kang, Sung BumKim, Ji-HwanJeong, Myeong HoonSanger, AmitKim, Chan UlKim, Chil-MinChoi, Kyoung Jin
DGIST Authors
Kim, Chil-Min
Issue Date
2019-12
Citation
Light: Science and Applications, 8(1)
Type
Article
Article Type
Article
Keywords
HIGHLY EFFICIENTSEMITRANSPARENT POLYMERSURFACE PASSIVATIONDOWN FABRICATIONPOWER-GENERATIONSILICONELECTRODELIGHTPERFORMANCENANOWIRES
ISSN
2047-7538
Abstract
Transparent solar cells (TSCs) are emerging devices that combine the advantages of visible transparency and light-to-electricity conversion. Currently, existing TSCs are based predominantly on organics, dyes, and perovskites; however, the rigidity and color-tinted transparent nature of those devices strongly limit the utility of the resulting TSCs for real-world applications. Here, we demonstrate a flexible, color-neutral, and high-efficiency TSC based on a freestanding form of n-silicon microwires (SiMWs). Flat-tip SiMWs with controllable spacing are fabricated via deep-reactive ion etching and embedded in a freestanding transparent polymer matrix. The light transmittance can be tuned from ~10 to 55% by adjusting the spacing between the microwires. For TSCs, a heterojunction is formed with a p-type polymer in the top portion of the n-type flat-tip SiMWs. Ohmic contact with an indium-doped ZnO film occurs at the bottom, and the side surface has an Al2O3 passivation layer. Furthermore, slanted-tip SiMWs are developed by a novel solvent-assisted wet etching method to manipulate light absorption. Finite-difference time-domain simulation revealed that the reflected light from slanted-tip SiMWs helps light-matter interactions in adjacent microwires. The TSC based on the slanted-tip SiMWs demonstrates 8% efficiency at a visible transparency of 10% with flexibility. This efficiency is the highest among Si-based TSCs and comparable with that of state-of-the-art neutral-color TSCs based on organic–inorganic hybrid perovskite and organics. Moreover, unlike others, the stretchable and transparent platform in this study is promising for future TSCs. © 2019, The Author(s).
URI
http://hdl.handle.net/20.500.11750/11379
DOI
10.1038/s41377-019-0234-y
Publisher
Nature Publishing Group
Related Researcher
  • Author Kim, Chil-Min Micro Laser Laboratory
  • Research Interests Laser; Nonlinear Dynamics; Quantum Chaos; Microcavity Laser
Files:
Collection:
Department of Emerging Materials ScienceMicro Laser Laboratory1. Journal Articles


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