Direct evidence of type II band alignment in nanoscale P3HT/CdSe heterostructures

Chun Hsiung Wang; Chih Wei Chen; Yung Ting Chen; Chiang Ting Chen; Yang Fang Chen; Shang Wei Chou; Chia Chun Chen

doi:10.1088/0957-4484/22/6/065202

Direct evidence of type II band alignment in nanoscale P3HT/CdSe heterostructures

Chun Hsiung Wang, Chih Wei Chen, Yung Ting Chen, Chiang Ting Chen, Yang Fang Chen, Shang Wei Chou, Chia Chun Chen

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Due to inherent advantages of both constituent materials, organic/inorganic hybrid composites have attracted increasing attention. One of the fundamental issues needed to be resolved is their band alignment, which governs most of the electrical and optical properties. Here, we report the investigation of optical transition in poly(3-hexylthiophene) (P3HT)/CdSe nano-composites (NCs). It is found that the relaxation dynamics of photo-carriers in NCs is dominated by charge separation effects. Based on the band bending effect and the quantum confinement energy of electrons in the conduction band of CdSe quantum dots, we provide direct evidence of type II band alignment in P3HT/CdSe NCs. The establishment of a type II transition in NCs is very useful for the future design of efficient optoelectronic devices based on conjugated polymer/semiconductor hybrid systems.

Original language	English
Article number	065202
Journal	Nanotechnology
Volume	22
Issue number	6
DOIs	https://doi.org/10.1088/0957-4484/22/6/065202
Publication status	Published - 2011 Feb 11

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Mechanics of Materials
Mechanical Engineering
Electrical and Electronic Engineering

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10.1088/0957-4484/22/6/065202

Cite this

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title = "Direct evidence of type II band alignment in nanoscale P3HT/CdSe heterostructures",

abstract = "Due to inherent advantages of both constituent materials, organic/inorganic hybrid composites have attracted increasing attention. One of the fundamental issues needed to be resolved is their band alignment, which governs most of the electrical and optical properties. Here, we report the investigation of optical transition in poly(3-hexylthiophene) (P3HT)/CdSe nano-composites (NCs). It is found that the relaxation dynamics of photo-carriers in NCs is dominated by charge separation effects. Based on the band bending effect and the quantum confinement energy of electrons in the conduction band of CdSe quantum dots, we provide direct evidence of type II band alignment in P3HT/CdSe NCs. The establishment of a type II transition in NCs is very useful for the future design of efficient optoelectronic devices based on conjugated polymer/semiconductor hybrid systems.",

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AU - Wang, Chun Hsiung

AU - Chen, Chih Wei

AU - Chen, Yung Ting

AU - Chen, Chiang Ting

AU - Chen, Yang Fang

AU - Chou, Shang Wei

AU - Chen, Chia Chun

PY - 2011/2/11

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Direct evidence of type II band alignment in nanoscale P3HT/CdSe heterostructures

Abstract

ASJC Scopus subject areas

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