Nonfullerene Electron Transporting Material Based on Naphthalene Diimide Small Molecule for Highly Stable Perovskite Solar Cells with Efficiency Exceeding 20%

Su Kyo Jung, Jin Hyuck Heo, Dae Woon Lee, Seung Chul Lee, Seung Heon Lee, Woojin Yoon, Hoseop Yun, Sang Hyuk Im, Jong H. Kim, O. Pil Kwon

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This study reports a new nonfullerene electron transporting material (ETM) based on naphthalene diimide (NDI) small molecules for use in high-performance perovskite solar cells (PSCs). These solar cells simultaneously achieve high power conversion efficiency (PCE) of over 20% and long-term stability. New NDI-ID (N,N′-Bis(1-indanyl)naphthalene-1,4,5,8-tetracarboxylic diimide) consisting of an N-substituted indane group having simultaneous alicyclic and aromatic characteristics is synthesized by a low-cost, one-step reaction, and facile purification method. The partially flexible characteristics of an alicyclic cyclopentene group on indane groups open the possibility of low-temperature solution processing. The conformational rigidity and aromaticity of phenyl and alicyclic groups contribute to high temporal stability by strong secondary bonds. NDI-ID has herringbone packed semiconducting NDI cores that exhibit up to 0.2 cm 2 V −1 s −1 electron mobility in field effect transistors. The inverted PSCs based on CH(NH 2 ) 2 PbI 3– x Br x with NDI-ID ETM exhibit very high PCEs of up to 20.2%, which is better than that of widely used PCBM (phenyl-C61-butyric acid methyl ester) ETM-based PSCs. Moreover, NDI-ID-based PSCs exhibit very high long-term temporal stability, retaining 90% of the initial PCE after 500 h at 100 °C with 1 sun illumination without encapsulation. Therefore, NDI-ID is a promising ETM for highly efficient, stable PSCs.

Original languageEnglish
Article number1800346
JournalAdvanced Functional Materials
Volume28
Issue number20
DOIs
Publication statusPublished - 2018 May 16

Keywords

  • electron transporting materials
  • naphthalene diimide
  • perovskite solar cells

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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