Terthieno[3,2-]Thiophene (6T) Based Low Bandgap Fused-Ring Electron Acceptor for Highly Efficient Solar Cells with a High Short-Circuit Current Density and Low Open-Circuit Voltage Loss

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Xueliang Shi
  • Jingde Chen
  • Ke Gao
  • Lijian Zuo
  • Zhaoyang Yao
  • Feng Liu
  • Jianxin Tang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Journal / PublicationAdvanced Energy Materials
Volume8
Issue number12
Early online date19 Jan 2018
Publication statusPublished - 25 Apr 2018

Abstract

A terthieno[3,2-]thiophene (6T) based fused-ring low bandgap electron acceptor, 6TIC, is designed and synthesized for highly efficient nonfullerene solar cells. The chemical, optical, and physical properties, device characteristics, and film morphology of 6TIC are intensively studied. 6TIC shows a narrow bandgap with band edge reaching 905 nm due to the electron-rich π-conjugated 6T core and reduced resonance stabilization energy. The rigid, π-conjugated 6T also offers lower reorganization energy to facilitate very low VOC loss in the 6TIC system. The analysis of film morphology shows that PTB7-Th and 6TIC can form crystalline domains and a bicontinuous network. These domains are enlarged when thermal annealing is applied. Consequently, the device based on PTB7-Th:6TIC exhibits a high power conversion efficiency (PCE) of 11.07% with a high JSC > 20 mA cm−2 and a high VOC of 0.83 V with a relatively low VOC loss (≈0.55 V). Moreover, a semitransparent solar cell based on PTB7-Th:6TIC exhibits a relatively high PCE (7.62%). The device can have combined high PCE and high JSC is quite rare for organic solar cells.

Research Area(s)

  • low bandgap semiconductors, nonfullerene acceptors, organic solar cells

Citation Format(s)

Terthieno[3,2-]Thiophene (6T) Based Low Bandgap Fused-Ring Electron Acceptor for Highly Efficient Solar Cells with a High Short-Circuit Current Density and Low Open-Circuit Voltage Loss. / Shi, Xueliang; Chen, Jingde; Gao, Ke; Zuo, Lijian; Yao, Zhaoyang; Liu, Feng; Tang, Jianxin; Jen, Alex K.-Y.

In: Advanced Energy Materials, Vol. 8, No. 12, 25.04.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review