Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells

Virendra Chauhan, Ross Hatton, Paul Sullivan, Tim Jones, Sangwan Cho, Louis Piper, Alex Demasi, Kevin Smith

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The operation of discrete heterojunction organic photovoltaic (OPV) cells employing chloro-aluminium phthalocyanine (ClAlPc) as the electron donor and C60 as the electron acceptor is reported and the characteristics are correlated with the energy level structure of the devices determined using X-ray photoelectron spectroscopy. The results give new insight into the origin of the open circuit voltage (Voc) in discrete heterojunction OPVs. The measured Voc in this system is found to be determined by: (i) the frontier orbital energy offsets between the donor and acceptor materials, accounting for the likely formation of an abrupt vacuum level shift at the heterojunction interface and (ii) the degree of alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital energy of the electron donor material. The generality of the findings is demonstrated by rationalising the Voc in OPVs employing the archetypal electron donor, copper phthalocyanine.

Original languageEnglish
Pages (from-to)1173-1178
Number of pages6
JournalJournal of Materials Chemistry
Volume20
Issue number6
DOIs
Publication statusPublished - 2010 Mar 24

Fingerprint

Photovoltaic cells
Open circuit voltage
Heterojunctions
Electrons
Molecular orbitals
Fermi level
Electron energy levels
X ray photoelectron spectroscopy
Vacuum
Copper
Aluminum
Electrodes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Chauhan, Virendra ; Hatton, Ross ; Sullivan, Paul ; Jones, Tim ; Cho, Sangwan ; Piper, Louis ; Demasi, Alex ; Smith, Kevin. / Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells. In: Journal of Materials Chemistry. 2010 ; Vol. 20, No. 6. pp. 1173-1178.
@article{cfc3e3fd73b343bf96bd100c98b9902f,
title = "Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells",
abstract = "The operation of discrete heterojunction organic photovoltaic (OPV) cells employing chloro-aluminium phthalocyanine (ClAlPc) as the electron donor and C60 as the electron acceptor is reported and the characteristics are correlated with the energy level structure of the devices determined using X-ray photoelectron spectroscopy. The results give new insight into the origin of the open circuit voltage (Voc) in discrete heterojunction OPVs. The measured Voc in this system is found to be determined by: (i) the frontier orbital energy offsets between the donor and acceptor materials, accounting for the likely formation of an abrupt vacuum level shift at the heterojunction interface and (ii) the degree of alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital energy of the electron donor material. The generality of the findings is demonstrated by rationalising the Voc in OPVs employing the archetypal electron donor, copper phthalocyanine.",
author = "Virendra Chauhan and Ross Hatton and Paul Sullivan and Tim Jones and Sangwan Cho and Louis Piper and Alex Demasi and Kevin Smith",
year = "2010",
month = "3",
day = "24",
doi = "10.1039/b919723k",
language = "English",
volume = "20",
pages = "1173--1178",
journal = "Journal of Materials Chemistry",
issn = "0959-9428",
publisher = "Royal Society of Chemistry",
number = "6",

}

Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells. / Chauhan, Virendra; Hatton, Ross; Sullivan, Paul; Jones, Tim; Cho, Sangwan; Piper, Louis; Demasi, Alex; Smith, Kevin.

In: Journal of Materials Chemistry, Vol. 20, No. 6, 24.03.2010, p. 1173-1178.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells

AU - Chauhan, Virendra

AU - Hatton, Ross

AU - Sullivan, Paul

AU - Jones, Tim

AU - Cho, Sangwan

AU - Piper, Louis

AU - Demasi, Alex

AU - Smith, Kevin

PY - 2010/3/24

Y1 - 2010/3/24

N2 - The operation of discrete heterojunction organic photovoltaic (OPV) cells employing chloro-aluminium phthalocyanine (ClAlPc) as the electron donor and C60 as the electron acceptor is reported and the characteristics are correlated with the energy level structure of the devices determined using X-ray photoelectron spectroscopy. The results give new insight into the origin of the open circuit voltage (Voc) in discrete heterojunction OPVs. The measured Voc in this system is found to be determined by: (i) the frontier orbital energy offsets between the donor and acceptor materials, accounting for the likely formation of an abrupt vacuum level shift at the heterojunction interface and (ii) the degree of alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital energy of the electron donor material. The generality of the findings is demonstrated by rationalising the Voc in OPVs employing the archetypal electron donor, copper phthalocyanine.

AB - The operation of discrete heterojunction organic photovoltaic (OPV) cells employing chloro-aluminium phthalocyanine (ClAlPc) as the electron donor and C60 as the electron acceptor is reported and the characteristics are correlated with the energy level structure of the devices determined using X-ray photoelectron spectroscopy. The results give new insight into the origin of the open circuit voltage (Voc) in discrete heterojunction OPVs. The measured Voc in this system is found to be determined by: (i) the frontier orbital energy offsets between the donor and acceptor materials, accounting for the likely formation of an abrupt vacuum level shift at the heterojunction interface and (ii) the degree of alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital energy of the electron donor material. The generality of the findings is demonstrated by rationalising the Voc in OPVs employing the archetypal electron donor, copper phthalocyanine.

UR - http://www.scopus.com/inward/record.url?scp=77949553659&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77949553659&partnerID=8YFLogxK

U2 - 10.1039/b919723k

DO - 10.1039/b919723k

M3 - Article

VL - 20

SP - 1173

EP - 1178

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

SN - 0959-9428

IS - 6

ER -