Improved exciton dissociation and charge transport in energetically cascaded trilayer organic solar cells

We demonstrate improved exciton dissociation and charge transport in trilayer organic solar cells (OSCs). The interlayer with an intermediate energy level between the main donor and acceptor levels assists the dissociation of excitons in the charge transfer state (CT) and aids the charge transport by increasing a CT state energy. Additionally, the total absorption of the OSC was increased due to the complementary absorption of the inserted interlayer. Experimentally, when a chloroaluminum phthalocyanine (ClAlPc) layer was inserted between copper phthalocyanine (CuPc) and C-60 in a trilayer OSC, the internal quantum efficiency (IQE) was greatly enhanced by 30% in the wavelength range of 350-550 nm. The enhancement of IQE results in an increase of the power conversion efficiency from 1.30% to 1.69%. (C) 2017 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2017-07
Language
English
Keywords

OPEN-CIRCUIT VOLTAGE; TRANSFER STATES; ENERGY-LOSSES; PHOTOVOLTAICS; GENERATION; INTERFACES; C-60

Citation

CURRENT APPLIED PHYSICS, v.17, no.7, pp.924 - 930

ISSN
1567-1739
DOI
10.1016/j.cap.2017.04.007
URI
http://hdl.handle.net/10203/224031
Appears in Collection
EEW-Journal Papers(저널논문)
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