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KOVALENKO, A. GUERERRO, A. GARCIA-BELMONTE, G.
Original Title
Role of vertical segregation in semitransparent organic photovoltaics
Type
journal article in Web of Science
Language
English
Original Abstract
In this work, the efficiency of semitransparent organic photovoltaic (OPV) devices for low intensity applications is investigated as a function of the processing conditions. It is observed that a thermal treatment of the organic layer induces fullerene migration toward the active layer/air interface. This physical process gives rise to different vertical segregation profiles of donor and acceptor molecules. Once the back contact is deposited, the amount of fullerene covering the surface will determine the contact selectivity and leakage current of the device. Control of this leakage current may not be essential for devices fabricated for high illumination condition applications. However, devices to be used under low illumination conditions may be highly influenced by the presence of this parasitic dark current which flows in the opposite direction to photogenerated current. At the proximity of the contacts, the vertical segregation profile is inferred from optical and electrical measurements. In particular, external quantum efficiency (EQE) measurements carried out from a relatively opaque back contact provide local information on the materials spatially close to the light source. Alternatively, capacitance−voltage measurements enable calculation of the percentage of fullerene molecules covering the cathode contact. Overall, a versatile method that can be used in regular and inverted configuration is presented that explains the different behavior observed for devices to be used under low illumination conditions.
Keywords
organic photovoltaics, low illumination conditions, contact selectivity, capacitance−voltage, impedance spectroscopy
Authors
RIV year
2014
Released
19. 12. 2014
Publisher
ACS
Location
USA
ISBN
1944-8244
Periodical
ACS APPL MATER INTER
Year of study
2015
Number
7
State
United States of America
Pages from
1234
Pages to
1239
Pages count
5
URL
http://pubs.acs.org/doi/pdf/10.1021/am5071859
BibTex
@article{BUT113778, author="Alexander {Kovalenko}", title="Role of vertical segregation in semitransparent organic photovoltaics", journal="ACS APPL MATER INTER", year="2014", volume="2015", number="7", pages="1234--1239", doi="10.1021/am5071859", issn="1944-8244", url="http://pubs.acs.org/doi/pdf/10.1021/am5071859" }