Fabrication and Characterization of Hybrid Organic–Inorganic
Electron Extraction Layers for Polymer Solar Cells toward Improved
Processing Robustness and Air Stability
Posted on 2018-04-13 - 00:00
Organic–inorganic
hybrid materials composed of bismuth and diaminopyridine are studied
as novel materials for electron extraction layers in polymer solar
cells using regular device structures. The hybrid materials are solution
processed on top of two different low band gap polymers (PTB7 or PTB7-Th)
as donor materials mixed with fullerene PC70BM as the acceptor.
The intercalation of the hybrid layer between the photoactive layer
and the aluminum cathode leads to solar cells with a power conversion
efficiency of 7.8% because of significant improvements in all photovoltaic
parameters, that is, short-circuit current density, fill factor, and
open-circuit voltage, similar to the reference devices using ZnO as
the interfacial layer. However when using thick layers of such hybrid
materials for electron extraction, only small losses in photocurrent
density are observed in contrast to the reference material ZnO of
pronounced losses because of optical spacer effects. Importantly,
these hybrid electron extraction layers also strongly improve the
device stability in air compared with solar cells processed with ZnO
interlayers. Both results underline the high potential of this new
class of hybrid materials as electron extraction materials toward
robust processing of air stable organic solar cells.
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Fredj, Donia; Pourcin, Florent; Alkarsifi, Riva; Kilinc, Volkan; Liu, Xianjie; Ben Dkhil, Sadok; et al. (2018). Fabrication and Characterization of Hybrid Organic–Inorganic
Electron Extraction Layers for Polymer Solar Cells toward Improved
Processing Robustness and Air Stability. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b16297
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AUTHORS (12)
DF
Donia Fredj
FP
Florent Pourcin
RA
Riva Alkarsifi
VK
Volkan Kilinc
XL
Xianjie Liu
SB
Sadok Ben Dkhil
NB
Nassira Chniba Boudjada
MF
Mats Fahlman
CV
Christine Videlot-Ackermann
OM
Olivier Margeat
JA
Jörg Ackermann
MB
Mohamed Boujelbene
KEYWORDS
donor materialsopen-circuit voltageelectron extraction layersProcessing Robustnessreference devicesZnO interlayersspacer effectsfullerene PC 70 BMPTB 7-Thpower conversion efficiencyPolymer Solar Cellsphotocurrent densitynovel materialsdevice stabilityelectron extraction materialsphotoactive layerphotovoltaic parametersband gap polymersPTB 7reference material ZnOaluminum cathodeelectron extractiondevice structures