articleJournal of the American Chemical SocietyJun 30, 2015Closed access

Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide

NANamyoung AhnDSDae‐Yong SonIJIn-Hyuk JangSMSeong Min KangMCMansoo Choi

Seoul National University · Sungkyunkwan University

PubMed
Indexed incrossrefpubmed

Abstract

High efficiency perovskite solar cells were fabricated reproducibly via Lewis base adduct of lead(II) iodide. PbI2 was dissolved in N,N-dimethyformamide with equimolar N,N-dimethyl sulfoxide (DMSO) and CH3NH3I. Stretching vibration of S═O appeared at 1045 cm(-1) for bare DMSO, which was shifted to 1020 and 1015 cm(-1) upon reacting DMSO with PbI2 and PbI2 + CH3NH3I, respectively, indicative of forming the adduct of PbI2·DMSO and CH3NH3I·PbI2·DMSO due to interaction between Lewis base DMSO and/or iodide (I(-)) and Lewis acid PbI2. Spin-coating of a DMF solution containing PbI2, CH3NH3I, and DMSO (1:1:1 mol %) formed a transparent adduct film, which was converted to a dark brown film upon heating at low…

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Topics & keywords

Topics
Keywords
  • Adduct
  • Chemistry
  • Iodide
  • Lewis acids and bases
  • Energy conversion efficiency
  • Base (topology)
  • Dimethyl sulfoxide
  • Inorganic chemistry
UN Sustainable Development Goals
  • Affordable and clean energy
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