TY  - JOUR
A1  - Pingel, Patrick
A1  - Arvind, Malavika
A1  - Kölln, Lisa
A1  - Steyrleuthner, Robert
A1  - Kraffert, Felix
A1  - Behrends, Jan
A1  - Janietz, Silvia
A1  - Neher, Dieter
T1  - p-Type Doping of Poly(3-hexylthiophene) with the Strong Lewis Acid Tris(pentafluorophenyl)borane
JF  - Advanced electronic materials
N2  - State-of-the-art p-type doping of organic semiconductors is usually achieved by employing strong -electron acceptors, a prominent example being tetrafluorotetracyanoquinodimethane (F(4)TCNQ). Here, doping of the semiconducting model polymer poly(3-hexylthiophene), P3HT, using the strong Lewis acid tris(pentafluorophenyl)borane (BCF) as a dopant, is investigated by admittance, conductivity, and electron paramagnetic resonance measurements. The electrical characteristics of BCF- and F(4)TCNQ-doped P3HT layers are shown to be very similar in terms of the mobile hole density and the doping efficiency. Roughly 18% of the employed dopants create mobile holes in either F-4 TCNQ- or BCF-doped P3HT, while the majority of doping-induced holes remain strongly Coulomb-bound to the dopant anions. Despite similar hole densities, conductivity and hole mobility are higher in BCF-doped P3HT layers than in F(4)TCNQ-doped samples. This and the good solubility in many organic solvents render BCF very useful for p-type doping of organic semiconductors.
KW  - charge carrier transport
KW  - charge transfer
KW  - conductivity
KW  - molecular doping
KW  - organic semiconductors
Y1  - 2016
U6  - https://doi.org/10.1002/aelm.201600204
SN  - 2199-160X
VL  - 2
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Hahn, Tobias
A1  - Tscheuschner, Steffen
A1  - Saller, Christina
A1  - Strohriegl, Peter
A1  - Boregowda, Puttaraju
A1  - Mukhopadhyay, Tushita
A1  - Patil, Satish
A1  - Neher, Dieter
A1  - Bässler, Heinz
A1  - Köhler, Anna
T1  - Role of Intrinsic Photogeneration in Single Layer and Bilayer Solar Cells with C-60 and PCBM
JF  - The journal of physical chemistry : C, Nanomaterials and interfaces
Y1  - 2016
U6  - https://doi.org/10.1021/acs.jpcc.6b08471
SN  - 1932-7447
VL  - 120
SP  - 25083
EP  - 25091
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Zerson, Mario
A1  - Neumann, Martin
A1  - Steyrleuthner, Robert
A1  - Neher, Dieter
A1  - Magerle, Robert
T1  - Surface Structure of Semicrystalline Naphthalene Diimide-Bithiophene Copolymer Films Studied with Atomic Force Microscopy
JF  - Macromolecules : a publication of the American Chemical Society
Y1  - 2016
U6  - https://doi.org/10.1021/acs.macromol.6b00988
SN  - 0024-9297
SN  - 1520-5835
VL  - 49
SP  - 6549
EP  - 6557
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Stolterfoht, Martin
A1  - Armin, Ardalan
A1  - Philippa, Bronson
A1  - Neher, Dieter
T1  - The Role of Space Charge Effects on the Competition between Recombination and Extraction in Solar Cells with Low-Mobility Photoactive Layers
JF  - The journal of physical chemistry letters
N2  - The competition between charge extraction and nongeminate recombination critically determines the current-voltage characteristics of organic solar cells (OSCs) and their fill factor. As a measure of this competition, several figures of merit (FOMs) have been put forward; however, the impact of space charge effects has been either neglected, or not specifically addressed. Here we revisit recently reported FOMs and discuss the role of space charge effects on the interplay between recombination and extraction. We find that space charge effects are the primary cause for the onset of recombination in so-called non-Langevin systems, which also depends on the slower carrier mobility and recombination coefficient. The conclusions are supported with numerical calculations and experimental results of 25 different donor/acceptor OSCs with different charge transport parameters, active layer thicknesses or composition ratios. The findings represent a conclusive understanding of bimolecular recombination for drift dominated photocurrents and allow one to minimize these losses for given device parameters.
Y1  - 2016
U6  - https://doi.org/10.1021/acs.jpclett.6b02106
SN  - 1948-7185
VL  - 7
SP  - 4716
EP  - 4721
PB  - American Chemical Society
CY  - Washington
ER  -