Jump to main content
Jump to site search

Issue 24, 2019
Previous Article Next Article

Bismuth oxysulfide modified ZnO nanorod arrays as an efficient electron transport layer for inverted polymer solar cells

Author affiliations

Abstract

Vertically aligned zinc oxide nanorod arrays (ZnO NRAs) are expected to provide a direct and stable electron transport pathway in polymer solar cells (PSCs) so as to enhance charge carrier collection and transport. However, the electrical coupling of ZnO NRAs/active layer and the surface defects limit the improvement of device performance. The modification of the surface of ZnO NRAs is an effective way to solve this problem. In this paper, we report the enhanced performance of inverted polymer solar cells (IPSCs) composed of poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C61-butyric acid methyl ester (PCBM) blends by using bismuth oxysulfide (Bi2O2S) nanoparticle modified ZnO NRAs as an efficient electron transport layer (ETL). It is found that the modification of the ZnO NRA surface with Bi2O2S nanoparticles can effectively passivate the surface traps, reduce the series resistance, improve the electrical coupling of ZnO NRAs/active layer, and enhance the crystallinity of the active layer. Consequently, the open-circuit voltage (Voc), the short-circuit current (Jsc) and the fill factor (FF) of the PSCs are considerably improved. The resulting power conversion efficiency (PCE) is improved to 3.61% as compared to 2.47% for the reference device without Bi2O2S modification. Moreover, this approach can also successfully improve the performance of other IPSCs composed of poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione))] (PBDB-T):3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene (ITIC) blends. The PCE of the device based on the Bi2O2S-modified ZnO NRAs is improved to 9.89% from 7.76% for the reference device without Bi2O2S nanoparticle modification. This work not only provides an effective means of surface modification of ZnO NRAs, but also demonstrates that the Bi2O2S material has potential for application in photovoltaic devices.

Graphical abstract: Bismuth oxysulfide modified ZnO nanorod arrays as an efficient electron transport layer for inverted polymer solar cells

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 Mar 2019, accepted on 24 May 2019 and first published on 25 May 2019


Article type: Paper
DOI: 10.1039/C9TA02447F
J. Mater. Chem. A, 2019,7, 14776-14789

  •   Request permissions

    Bismuth oxysulfide modified ZnO nanorod arrays as an efficient electron transport layer for inverted polymer solar cells

    Z. Wu, H. Yu, S. Shi and Y. Li, J. Mater. Chem. A, 2019, 7, 14776
    DOI: 10.1039/C9TA02447F

Search articles by author

Spotlight

Advertisements