Vertical phase separation in poly(3-hexylthiophene): Fullerene derivative blends and its advantage for inverted structure solar cells

Zheng Xu, Li Min Chen, Guanwen Yang, Chun Hao Huang, Jianhui Hou, Yue Wu, Gang Li, Chain-Shu Hsu, Yang Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

629 Scopus citations

Abstract

A method which enables the investigation ofthe buried interfaces without altering the properties ofthe polymer films is used to study vertical phase separation of spin-coated poly(3-hexylthiophene) (P3HT):fullerene derivative blends. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) analysis reveals the P3HTenrichment atthefree (air) surfaces and abundance offullerene derivatives at the organic/substrate interfaces. The vertical phase separation is attributed to the surface energy difference ofthe components and their interactions with the substrates. This inhomogeneous distribution ofthe donor and acceptor components significantly affects photovoltaic device performance and makes the inverted device structure a promising choice.

Original languageEnglish
Pages (from-to)1227-1234
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number8
DOIs
StatePublished - 23 Apr 2009

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