Unprecedentedly high indoor performance (efficiency > 34 %) of perovskite photovoltaics with controlled bromine doping

Ju Won Lim, Hannah Kwon, Sang Hyeon Kim, Young Jun You, Ji Soo Goo, Doo Hyun Ko, Hyun Jeong Lee, Dawoon Kim, In Chung, Tae Geun Kim, Dong Ha Kim, Jae Won Shim

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Indoor lighting-driven photovoltaic cells have significant potential for energy generation due to their ability to convert waste lighting into reusable sources and energy generation regardless of weather conditions. As a promising renewable source of energy, indoor perovskite photovoltaic cells possess the advantages of high efficiency, facile processability, and cost-effectiveness. Here, we propose stoichiometry-controlled perovskite-based photovoltaic cells illuminated under the dim light-emitting diode (LED) to capture and recycle the light sources. Among the various stoichiometric methods tested, 10% bromide-doped perovskite photoactive layers exhibit the best performance as a result of better crystallization and uniform surface. This helps to form larger grains of perovskite with reduced trap sites and defects, which suppresses carrier trapping and non-radiation recombination centers, resulting in improved device performance. Moreover, additional substitution by an appropriate halide increases the stability of the conventional perovskite by forming a pseudo-cubic phase. Consequently, the photovoltaic device examined under dim LED (1000 lx) indoor lighting exhibits an average power conversion efficiency of 34.5 ± 1.2%, which is superior by 18% compared with that of a control device (29.2 ± 1.6%). These results reveal the potential of indoor-driven perovskite photovoltaic cells as next-generation power sources which may pioneer the development of new types of indoor electronics.

Original languageEnglish
Article number104984
JournalNano Energy
StatePublished - Sep 2020

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd


  • Bromine doping
  • Indoor photovoltaics
  • Perovskite solar cells
  • Stoichiometry-control


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