Functional p-Type, Polymerized Organic Electrode Interlayer in CH3NH3PbI3 Perovskite/Fullerene Planar Heterojunction Hybrid Solar Cells

Tsung Yu Chiang, Gang Lun Fan, Jun Yuan Jeng, Kuo Cheng Chen, Peter Chen, Ten Chin Wen, Tzung Fang Guo, Ken Tsung Wong

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Thermal curing of the styrene-functionalized 9,9-diarylfluorene-based triaryldiamine monomer (VB-DAAF) forms an ideal p-type organic electrode interlayer capable of resisting solvation of the polar precursor solution in fabricating methylammonium lead iodide (CH3NH3PbI3) perovskite/fullerene (C60) planar heterojunction hybrid solar cells. The polymerized VB-DAAF film exhibits a good energy level alignment with the valence-band-edge level of the CH3NH3PbI3 perovskite to facilitate the transport of holes. The large energy barrier to the conduction-band-edge level of the CH3NH3PbI3 perovskite effectively blocks electrons from reaching the positive electrode and reduces the photon energy loss due to recombination. The best-performing cell with the configuration of glass/indium-tin oxide/polymerized VB-DAAF/CH3NH3PbI3 perovskite/C60/bathocuproine/aluminum is free of a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) layer to achieve an open-circuit voltage (VOC) = 1.02 V, a short-circuit current (JSC) = 18.92 mA/cm2, and a fill factor (FF) = 0.78, corresponding to a power conversion efficiency (PCE) of 15.17% under standard 1 sun AM 1.5G simulated solar irradiation. The performance is much superior to the device applying the PEDOT:PSS interlayer with photovoltaic parameters of VOC = 0.85 V, JSC = 16.37 mA/cm2, and FF = 0.74, corresponding to a PCE of 10.27%. Additionally, we had applied a UV-assisted process to polymerize the VB-DAAF film at relatively lower temperature and fabricate decent perovskite-based solar cells on the flexible substrate for real applications.

Original languageEnglish
Pages (from-to)24973-24981
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number44
DOIs
Publication statusPublished - 2015 Nov 11

All Science Journal Classification (ASJC) codes

  • General Materials Science

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