Interfacial modification to improve inverted polymer solar cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Steven K. Hau
  • Orb Acton
  • Nam Seob Baek
  • Hong Ma

Detail(s)

Original languageEnglish
Pages (from-to)5113-5119
Journal / PublicationJournal of Materials Chemistry
Volume18
Issue number42
Online published1 Oct 2008
Publication statusPublished - 14 Nov 2008
Externally publishedYes

Abstract

We report improved device performance of poly(3-hexylthiophene) (P3HT) and [6,6]phenyl C61 butyric acid methyl ester (PCBM)-based inverted bulk-heterojunction (BHJ) solar cells through the modified interface of the TiO2/BHJ with a series of carboxylic acid functionalized self-assembled monolayers (SAMs). The SAMs reduce the series resistance and improve the shunt resistance of the cell leading to increased fill factor and photocurrent density. Different aspects of device improvement can be affected depending on the nature of the SAMs. Modification with a C60-SAM shows the largest enhancement leading to a 35% improvement (η = 3.78%) over unmodified inverted devices (η = 2.80%). This SAM serves multiple functions to affect the photoinduced charge transfer at the interface to reduce the recombination of charges, passivation of inorganic surface trap states, improve the exciton dissociation efficiency at the polymer/TiO2 interface as well as a template to influence the overlayer BHJ distribution of phases, morphology and crystallinity leading to better charge selectivity and improved solar cell performance. © 2008 The Royal Society of Chemistry.

Citation Format(s)

Interfacial modification to improve inverted polymer solar cells. / Hau, Steven K.; Yip, Hin-Lap; Acton, Orb; Baek, Nam Seob; Ma, Hong; Jen, Alex K.-Y.

In: Journal of Materials Chemistry, Vol. 18, No. 42, 14.11.2008, p. 5113-5119.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review