Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts

Zesheng Liu; Yawen Li; Xiaojun Zhao; Yufan Zhu; Yuze Lin

doi:10.1007/s10118-022-2754-9

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Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts

RESEARCH ARTICLE | Updated：2022-07-21

- Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts
- Chinese Journal of Polymer Science Vol. 40, Issue 8, Pages: 937-943(2022)
- Affiliations：
  
  a.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  linyz@iccas.ac.cn
- Funds：
- DOI：10.1007/s10118-022-2754-9
  CLC：
- Received：07 March 2022，
  
  Revised：2022-4-3，
  
  Accepted：07 April 2022，
  
  Online First：22 June 2022，
  
  Published：01 August 2022
- Accepted：
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Liu, Z.; Li, Y.; Zhao, X.; Zhu, Y.; Lin, Y. Revealing the unusual efficiency enhancement of organic solar cells with polymer-donor-treated cathode contacts. Chinese J. Polym. Sci. 2022, 40, 937–943

Zesheng Liu, Yawen Li, Xiaojun Zhao, et al. Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts[J]. Chinese Journal of Polymer Science, 2022, 40(8): 937-943.
Liu, Z.; Li, Y.; Zhao, X.; Zhu, Y.; Lin, Y. Revealing the unusual efficiency enhancement of organic solar cells with polymer-donor-treated cathode contacts. Chinese J. Polym. Sci. 2022, 40, 937–943 DOI： 10.1007/s10118-022-2754-9.

Zesheng Liu, Yawen Li, Xiaojun Zhao, et al. Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts[J]. Chinese Journal of Polymer Science, 2022, 40(8): 937-943. DOI： 10.1007/s10118-022-2754-9.

摘要

The polymer donor containing specific groups

such as carbonyl group and fluorine atom

can form hydrogen bond with triethanolamine

which can enlarge the negative electrostatic potential of the oxygen atoms on the hydroxyl group and enhance the passivation effect on the oxygen vacancies of the metal oxides

thus improving the performance of organic solar cells.

Abstract

The metal oxides with low trap density of states as the electron transport layer are crucial for the high performance of the organic solar cells (OSCs). It is universally acknowledged that modifying n-type metal oxide contacts with polymer donors will harm the carrier extraction on account of the mismatched energy level. However

we find that modifying interlayer consisting of the alcohol amines with some polymer donor additive can unusually enhance the performance of the OSCs. Compared with triethanolamine (TEA) passivated ZnO

TEA:polymer donor treated ZnO shows lower trap density and enhances electron mobility resulting in higher current density in OSC devices. Here

we reveal that the enhanced oxygen-defect passivation ability of TEA with polymer additive is attributed to the enhanced negative electrostatic potential of TEA owing to the hydrogen bond formation between the polymer and the hydroxyl group in TEA. This strategy that enhancing the negative electrostatic potential of the passivators for improving oxygen defect passivation can be extended to other types of organic electronic devices.

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