Li, Z. et al.Z. et al.LiCHU-CHEN CHUEH2021-02-042021-02-042020Li, Z.;Zhang, J.;Wu, S.;Deng, X.;Li, F.;Liu, D.;Lee, C.C.;Lin, F.;Lei, D.;Chueh, C.-C.;Zhu, Z.;Jen, A.K.-Y.https://www.scopus.com/inward/record.url?eid=2-s2.0-85091206671&partnerID=40&md5=17b9a1a3e5e95ef559f7de9046a404b3https://scholars.lib.ntu.edu.tw/handle/123456789/547548Wide-bandgap perovskite solar cells (PVSCs) possess significant potential in providing reliable power sources for applications in the Internet of Things (IoT) ecosystem under indoor light illumination. However, the wide-bandgap PVSCs usually suffer from photo-induced phase segregation and non-radiative energy loss caused by the Shockley-Read-Hall (SRH) type trap-assisted recombination at the interfaces in the devices. To address these issues, a simple strategy by applying phenethylammonium halides to reduce the energy loss and suppress the phase segregation of wide-bandgap PVSCs is developed. The devices incorporated with phenethylammonium chloride (PEACl) is revealed to achieve a high open-circuit voltage (VOC) of 1.26 V, leading to a merit power conversion efficiency (PCE) of 18.3%, which is the best performance among the inverted wide-bandgap PVSCs (~1.75 eV) under one sun illumination. Meanwhile, the photovoltaic performance of the device is also significantly enhanced, especially under a white light-emitting diode (LED) with an illumination of 1000 lux, showing a PCE of 35.6% with a high VOC of 1.08 V. Impressively, the device delivers a minimum energy loss of 670 meV, which is among the smallest value reported for perovskite-based indoor photovoltaics. © 2020 Elsevier LtdDefect passivation; Indoor light application; Minimized energy loss; Phase segregation suppression; Wide-bandgap perovskite photovoltaic[SDGs]SDG7Chlorine compounds; Conversion efficiency; Energy dissipation; Energy gap; Internet of things; Open circuit voltage; Perovskite; Phase separation; Internet of thing (IOT); Nonradiative energy; One-sun illumination; Photovoltaic performance; Power conversion efficiencies; Shockley read halls; Trap-assisted recombinations; White light emitting diodes; Perovskite solar cellsjournal article10.1016/j.nanoen.2020.1053772-s2.0-85091206671