Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

Jai Singh; Monishka Narayan; David Ompong; Fu Rong ZHU

doi:10.1007/s10854-017-6443-3

Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

Jai Singh^*, Monishka Narayan, David Ompong, Fu Rong ZHU

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

31 Citations (Scopus)

Abstract

It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC₇₁BM and found to agree very well qualitatively.

Original language	English
Pages (from-to)	7095-7099
Number of pages	5
Journal	Journal of Materials Science: Materials in Electronics
Volume	28
Issue number	10
DOIs	https://doi.org/10.1007/s10854-017-6443-3
Publication status	Published - 1 May 2017

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1007/s10854-017-6443-3

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title = "Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells",

abstract = "It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.",

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T1 - Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

AU - Singh, Jai

AU - Narayan, Monishka

AU - Ompong, David

AU - ZHU, Fu Rong

PY - 2017/5/1

Y1 - 2017/5/1

N2 - It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.

AB - It is emphasized that the formation of charge transfer (CT) excitons in bulk heterojunction (BHJ) organic solar cells (OSCs) does not automatically lead to the dissociation of excitons and generation of charge carriers due to the built-in electric field created by the difference in the work functions of the electrodes. Like Frenkel excitons, CT excitons are also charge neutral excited entities and cannot be efficiently dissociated by such electric field. A condition of the dissociation of CT excitons is proposed and used to derive the rates of exciton dissociation in BHJ OSCs. Results are calculated and compared with experiments for the BHJ OSC of PTB7: PC71BM and found to agree very well qualitatively.

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U2 - 10.1007/s10854-017-6443-3

DO - 10.1007/s10854-017-6443-3

M3 - Journal article

AN - SCOPUS:85011660689

SN - 0957-4522

VL - 28

SP - 7095

EP - 7099

JO - Journal of Materials Science: Materials in Electronics

JF - Journal of Materials Science: Materials in Electronics

IS - 10

ER -

Dissociation of charge transfer excitons at the donor–acceptor interface in bulk heterojunction organic solar cells

Abstract

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