Formamidinium-based planar heterojunction perovskite solar cells with alkali carbonate-doped zinc oxide layer

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RSC Advances, ISSN: 2046-2069, Vol: 8, Issue: 43, Page: 24110-24115

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Jeong, Jaeki; Kim, Haeyeon; Yoon, Yung Jin; Walker, Bright; Song, Seyeong; Heo, Jungwoo; Park, Song Yi; Kim, Jae Won; Kim, Gi-Hwan; Kim, Jin Young
Royal Society of Chemistry (RSC); The Royal Society of Chemistry; ROYAL SOC CHEMISTRY
Chemistry; Chemical Engineering
article description
We herein demonstrate n-i-p-type planar heterojunction perovskite solar cells employing spin-coated ZnO nanoparticles modified with various alkali metal carbonates including LiCO, NaCO, KCOand CsCO, which can tune the energy band structure of ZnO ETLs. Since these metal carbonates doped on ZnO ETLs lead to deeper conduction bands in the ZnO ETLs, electrons are easily transported from the perovskite active layer to the cathode electrode. The power conversion efficiency of about 27% is improved due to the incorporation of alkali carbonates in ETLs. As alternatives to TiOand n-type metal oxides, electron transport materials consisting of doped ZnO nanoparticles are viable ETLs for efficient n-i-p planar heterojunction solar cells, and they can be used on flexible substrates via roll-to-roll processing.