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Ultra-flexible semitransparent organic photovoltaics

npj Flexible Electronics 2023年第1期7卷 274-282页

作者： Hanbee Lee Soyeong Jeong Jae-Hyun Kim Yong-Ryun Jo Hyeong Ju Eun Byoungwook park Sung Cheol Yoon Jong H.Kim Seung-Hoon Lee sungjun park Department of Electrical and Computer Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Chemistry and Centre for Processable Electronics Imperial College LondonWhite City W120BZUK Department of Intelligence Semiconductor Engineering Ajou UniversitySuwon 16499Republic of Korea Advanced Photonics Research Institute(APRI) Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Division of Molecular Science and Technology Ajou UniversitySuwon 16499Republic of Korea Division of Advanced Materials Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea Division of Advanced materials Engineering Kongju National University1223-24 Cheonan-daeroSeobuk-guCheonan-siChungcheongnam-doRepublic of Korea

Ultra-flexible organic photovoltaics(OPVs)are promising candidates for next-generation power sources owing to their low weight,transparency,and ***,obtaining ultra-flexibility under extreme repetitive mechanical stress while maintaining optical transparency remains challenging because of the intrinsic brittleness of transparent ***,we introduce straindurable ultra-flexible semitransparent OPVs with a thickness below 2μ*** conformal surface coverage of nanoscale thin metal electrodes(<10 nm)is achieved,resulting in extremely low flexural rigidity and high strain ***-depth optical and electrical analyses on ultrathin metal electrodes showed that the devices maintain over 73%of their initial efficiency after 1000 cycles of repetitive compression and release at 66%compressive strain,and the average visible light transmittances remain higher than 30%.To our knowledge,this is the first systematical study on mechanical behaviors of strain-durable ultra-flexible ST-OPVs through precise adjustment of each ultrathin electrode thickness toward the emergence of next-generation flexible power sources.

关键词： transparency durability rigidity

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Flexible kesterite thin-film solar cells under stress

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npj Flexible Electronics 2022年第1期6卷 863-870页

作者： Ha Kyung park Yunae Cho Juran Kim Sammi Kim sungjun Kim Jeha Kim Kee-Jeong Yang Dae-Hwan Kim Jin-Kyu Kang William Jo Department of Physics Ewha Womans UniversitySeoul 03760Republic of Korea Division of Energy Technology Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea Department of Solar&Energy Engineering Cheongju UniversityCheongju 28503Republic of Korea

Understanding the stress-induced phenomena is essential for improving the long-term application of flexible solar cells to non-flat ***,we investigated the electronic band structure and carrier transport mechanism of Cu2ZnSn(S,Se)4(CZTSSe)photovoltaic devices under mechanical *** efficient flexible CZTSSe devices were fabricated controlling the Na *** electronic structure of CZTSSe was deformed with stress as the band gap,valence band edge,and work function *** properties of the bent CZTSSe surface were probed by Kelvin probe force microscopy and the CZTSSe with Na showed less degraded carrier transport compared to the CZTSSe without *** local open-circuit voltage(VOC)on the bent CZTSSe surface decreased due to limited carrier *** reduction of local VOC occurred larger with convex bending than in concave bending,which is consistent with the degradation of device *** study paves the way for understanding the stress-induced optoelectronic changes in flexible photovoltaic devices.

关键词： optoelectronic stress bending

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