Rational tuning of intermolecular and intramolecular interactions enabling high-efficiency indoor organic photovoltaics

Lin Xie, Jinsheng Zhang, Wei Song, Jinfeng Ge, Dandan Li, Rong Zhou, Jianqi Zhang, Xiaoli Zhang, Daobing Yang, Bencan Tang, Tao Wu, Ziyi Ge

Research output: Journal PublicationArticlepeer-review

Abstract

Indoor organic photovoltaics (IOPVs) are one of promising candidates for transferring artificial illumination to power the Internet of Things (IoT). However, their power conversion efficiencies (PCE) are limited by the fact that only a few efficient non-fullerene acceptors are available for IOPVs. Herein, new strategy is adopted to tune the intramolecular charge transfer (intra-CT) and intermolecular charge transfer (inter-CT) to achieve high PCEs under indoor environment in the combination of changing skeleton from symmetry to asymmetry and end group from chlorination to non-chlorination. The study reveals that, in comparison with symmetric molecule BTP-2ThCl, asymmetric structure TB-SCl possesses a smaller intra-CT resulting in higher VOC and strengthened inter-CT for neighboring acceptors resulting in more efficient carrier collection and thus higher FF. Moreover, the non-chlorine molecule TB-S exhibits smaller intra and inter-CT leading to further promoting VOC but smaller FF compared with TB-SCl under 1-sun illumination. When the illumination is switched to artificial light, the mitigated trap state, minimized leakage current, and suppressed non-radiative energy loss (∆Enonrad) enable a novel acceptor TB-S yielding high-efficiency rigid PCE of 23.3 % which surpasses TB-SCl and flexible PCE of 20.02% which is one of the best PCE for flexible IOPVs. Our observation provides a new insight into molecule structure modification to promote the indoor photovoltaic performance.

Original languageEnglish
Article number107414
JournalNano Energy
Volume99
DOIs
Publication statusPublished - Aug 2022

Keywords

  • Flexible device
  • Indoor organic photovoltaics
  • Intermolecular interaction
  • Intramolecular interaction
  • Trap state
  • Voltage loss

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)
  • Electrical and Electronic Engineering

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