Improved cathode for semitransparent organic solar cells

Ging Meng Ng*, Wei Peng Goh, Vijila Chellappan, Hoi Lam TAM, Fu Rong ZHU

*Corresponding author for this work

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

Abstract

High quality transparent cathode is one of the major impediments to achieve high performance semitransparent organic solar cells (OSCs). This work reports a study of the effect of Al/indium tin oxide (ITO) cathode for application in poly(3-hexylthiophene) (P3HT):1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C 60 (PCBM)-based semitransparent OSCs. The power conversion efficiency (PCE) and lifetime of OSCs made with Al/ITO-based cathode are studied and compared with structure identical OSCs made with Ca/Ag/ITO-based cathode. The interfacial properties at polymer/cathode interface were investigated using X-ray Photoelectron Spectroscopy (XPS). It is found that an ultrathin Al:AlOx interlayer was formed at polymer/cathode interface, induced during the ITO deposition. Semitransparent OSCs with Al/ITO cathode having a PCE of up to 2.37% with an average transmittance >40% at light wavelength of 650nm were demonstrated. The results reveal that the presence of an ultrathin AlOx layer at the polymer/cathode interface plays a role in determining the stability of the semitransparent OSCs. The possible designs to improve the performance of semitransparent organic solar cells over the two competing indexes of power conversion efficiency and transmittance are discussed.

Original languageEnglish
Title of host publication2010 OSA-IEEE-COS Advances in Optoelectronics and Micro/Nano-Optics, AOM 2010
DOIs
Publication statusPublished - 2010
Event2010 OSA-IEEE-COS Advances in Optoelectronics and Micro/Nano-Optics, AOM 2010 - Guangzhou, China
Duration: 3 Dec 20106 Dec 2010

Publication series

Name2010 OSA-IEEE-COS Advances in Optoelectronics and Micro/Nano-Optics, AOM 2010

Conference

Conference2010 OSA-IEEE-COS Advances in Optoelectronics and Micro/Nano-Optics, AOM 2010
Country/TerritoryChina
CityGuangzhou
Period3/12/106/12/10

Scopus Subject Areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

User-Defined Keywords

  • Conjugated polymer
  • Indium tin oxide
  • Lifetime
  • Organic solar cell
  • Semitransparent

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