Toward high efficiency of inverted organic solar cells: Concurrent improvement in optical and electrical properties of electron transport layers

S. H. Tsai, S. T. Ho, H. J. Jhuo, C. R. Ho, S. A. Chen, Jr-Hau He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The conversion efficiency (η) of organic solar cells (OSCs) constructed with ITO/ZnO/P3HT:PCBM/PEDOT:PSS/Ag is improved by incorporating Al into ZnO films (AZO) as electron transport layers (ETLs). Compared with ZnO films, AZO-based OSCs enhance η by ∼13.9% via improving short-circuit photocurrent density from 10.73 to 11.12 mA cm -2 and fill factor from 53.7% to 60.8%. Doping Al into ZnO ETLs not only optimizes band alignment between organic active layers and ETLs and increases carrier concentration, conductivity, and bandgap of ZnO films facilitating more light into OSCs but also improves the absorption of P3HT by promoting the molecular ordering of P3HT.

Original languageEnglish (US)
Article number253111
JournalApplied Physics Letters
Volume102
Issue number25
DOIs
StatePublished - Jun 24 2013

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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