From binary to multicomponent photoactive layer: A promising complementary strategy to efficient hybrid solar cells

Changwen Liu, Zeliang Qiu, Feng Li, Weili Meng, Wenjin Yue, Fapei Zhang, Qiquan Qiao, Mingtai Wang

Research output: Contribution to journalArticlepeer-review

Abstract

A strategy is demonstrated for fabrication of highly efficient hybrid solar cells based on the polymer/nanoarrays with complementary multicomponents in photoactive layer, including a scenario to controllably synthesize ternary ZnO/CdS/Sb2S3-core/shell/shell nanoarrays (ZCS-NAs) for a high open-circuit voltage (Voc) and short-circuit current and an approach to dope amorphous polymer with lithium bis(trifluoromethanesulfonyl) amide at nanoscale for a remarkably improved fill factor. With the integrated benefits from the complementary multicomponents having optimized nanoarray structure and doping concentration, an efficiency up to 5.01% under AM 1.5 illumination (100mW/cm2) is achieved in the polymer/ZCS-NA devices with poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) as the polymer. To the best of our knowledge, this is the highest efficiency in the polymer/nanoarray devices. It is found that the Voc in the multicomponent solar cells is determined by the band level difference between ZnO core and polymer, and sufficient photo-excitation of the polymer is necessary for efficient photocurrent generation. The component effects on device performance are elucidated and a model concerning the effective polymer phase and illumination attenuation between nanorods is proposed for understanding the charge generation from polymer absorption in the multicomponent solar cells.

Original languageEnglish (US)
Pages (from-to)686-697
Number of pages12
JournalNano Energy
Volume12
DOIs
StatePublished - Mar 1 2015
Externally publishedYes

Keywords

  • Conjugated polymer
  • Interfacial modification
  • Solar cells
  • ZnO nanorod array

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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