Ho, P.-H.P.-H.HoLee, W.-C.W.-C.LeeLiou, Y.-T.Y.-T.LiouChiu, Y.-P.Y.-P.ChiuShih, Y.-S.Y.-S.ShihChen, C.-C.C.-C.ChenSu, P.-Y.P.-Y.SuLi, M.-K.M.-K.LiChen, H.-L.H.-L.ChenLiang, C.-T.C.-T.LiangCHI-TE LIANGYA-PING CHIUCHUN-WEI CHENHSUEN-LI CHEN2020-05-122020-05-122015https://scholars.lib.ntu.edu.tw/handle/123456789/491294Compared to widely-reported graphene-based anodes, the task of obtaining a stable graphene-based cathode is generally more difficult to achieve because n-type graphene devices have very limited thermal and chemical stabilities, and are usually sensitive to the influence of the ambient environment. This work developed a novel "sunlight-activated" graphene-heterostructure transparent electrode in which photogenerated charges from a light-absorbing material are transferred to graphene, resulting in the modulation of electrical properties of the graphene transparent electrode caused by a strong light-matter interaction at graphene-heterostructure interfaces. A photoactive graphene/TiOx-heterostructure transparent cathode was used to fabricate an n-graphene/p-Si Schottky junction solar cell, achieving a record-high power conversion efficiency (>10%). The photoactive graphene-heterostructure transparent electrode, which exhibits excellent tunable electrical properties under sunlight illumination, has great potential for use in the future development of graphene-based photovoltaics and optoelectronics. © 2015 The Royal Society of Chemistry.[SDGs]SDG7Cathodes; Graphene devices; Solar cells; Transparent electrodes; Absorbing materials; Ambient environment; Heterostructure interfaces; High power conversion; Light-matter interactions; Photogenerated charge; Thermal and chemical stabilities; Transparent cathode; Graphene; alkene; electrical property; electrode; energy efficiency; fuel cell; performance assessment; photovoltaic system; stabilizationjournal article10.1039/c5ee00548e2-s2.0-84936860072https://www.scopus.com/inward/record.uri?eid=2-s2.0-84936860072&doi=10.1039%2fc5ee00548e&partnerID=40&md5=02e6d44008ae868327bedab5af51de31