Unraveling Urbach Tail Effects in High-Performance Organic Photovoltaics : Dynamic vs Static Disorder

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

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Author(s)

  • Chujun Zhang
  • Jun Yuan
  • Johnny Ka Wai Ho
  • Yaxin Gao
  • Wei Liu
  • Hui Zhong
  • He Yan
  • Yingping Zou
  • Shu Kong So

Detail(s)

Original languageEnglish
Pages (from-to)1971-1979
Journal / PublicationACS Energy Letters
Volume7
Issue number6
Online published16 May 2022
Publication statusPublished - 10 Jun 2022

Link(s)

Abstract

The origin of Urbach energy (EU) in organic semiconductors and its effect on photovoltaic properties remain a topic of intense interest. In this letter, we demonstrate quantitative information on the EU value in emerging Y-series molecules by an in-depth analysis of the line shape of the temperature-dependent quantum efficiency spectra. We found that the static disorder (EU(0)), which is dominated by the conformational uniformity in Y-series acceptors, contributes 10-25 meV to the total Urbach energy. Particularly, this static contribution in organic solar cells (OSCs) is much higher than those (EU(0) ≈ 3-6 meV) in inorganic/hybrid counterparts, such as CH3NH3PbI3 perovskite, crystalline silicon (c-Si), gallium nitride (GaN), indium phosphide (InP), and gallium arsenide (GaAs). More importantly, we establish clear correlations between the static disorder and photovoltaic performance and open-circuit voltage loss. These results suggest that suppressing the static disorder via rational molecular design is clearly a path for achieving higher performance.

Research Area(s)

Citation Format(s)

Unraveling Urbach Tail Effects in High-Performance Organic Photovoltaics : Dynamic vs Static Disorder. / Zhang, Chujun; Mahadevan, Sudhi; Yuan, Jun et al.

In: ACS Energy Letters, Vol. 7, No. 6, 10.06.2022, p. 1971-1979.

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

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