Efficient and Stable Perovskite Solar Cells via Dual Functionalization of Dopamine Semiquinone Radical with Improved Trap Passivation Capabilities

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

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Author(s)

  • Qifan Xue
  • Meiyue Liu
  • Zhenchao Li
  • Lei Yan
  • Zhicheng Hu
  • Jiawen Zhou
  • Wenqiang Li
  • Xiao-Fang Jiang
  • Baomin Xu
  • Fei Huang
  • Yuan Li
  • Yong Cao

Detail(s)

Original languageEnglish
Article number1707444
Journal / PublicationAdvanced Functional Materials
Volume28
Issue number18
Publication statusPublished - 4 May 2018
Externally publishedYes

Abstract

Highly efficient planar heterojunction perovskite solar cells (PVSCs) with dopamine (DA) semiquinone radical modified poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (DA-PEDOT:PSS) as a hole transporting layer (HTL) were fabricated. A combination of characterization techniques were employed to investigate the effects of DA doping on the electron donating capability of DA-PEDOT:PSS, perovskite film quality and charge recombination kinetics in the solar cells. Our study shows that DA doping endows the DA-PEDOT:PSS-modified PVSCs with a higher radical content and greater perovskite to HTL charge extraction capability. In addition, the DA doping also improves work function of the HTL, increases perovskite film crystallinity, and the amino and hydroxyl groups in DA can interact with the undercoordinated Pb atoms on the perovskite crystal, reducing charge-recombination rate and increasing charge-extraction efficiency. Therefore, the DA-PEDOT:PSS-modified solar cells outperform those based on PEDOT:PSS, increasing open-circuit voltage (V oc) and power conversion efficiency (PCE) to 1.08 V and 18.5%, respectively. Even more importantly, the efficiency of the unencapsulated DA-PEDOT:PSS-based PVSCs are well retained with only 20% PCE loss after exposure to air for 250 hours. These in-depth insights into structure and performance provide clear and novel guidelines for the design of effective HTLs to facilitate the practical application of inverted planar heterojunction PVSCs.

Research Area(s)

  • dopamine, PEDOT, perovskite solar cells, semiquinone radicals, trap passivation

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Efficient and Stable Perovskite Solar Cells via Dual Functionalization of Dopamine Semiquinone Radical with Improved Trap Passivation Capabilities. / Xue, Qifan; Liu, Meiyue; Li, Zhenchao; Yan, Lei; Hu, Zhicheng; Zhou, Jiawen; Li, Wenqiang; Jiang, Xiao-Fang; Xu, Baomin; Huang, Fei; Li, Yuan; Yip, Hin-Lap; Cao, Yong.

In: Advanced Functional Materials, Vol. 28, No. 18, 1707444, 04.05.2018.

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