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Traps and transport resistance: the next frontier for stable state-of-the-art non-fullerene acceptor solar cells
Christopher Wöpke, Clemens Göhler, Maria Saladina +17
Stability is one of the most important challenges facing organic solar cells (OSC) on their path to commercialization. In the high-performance material system PM6:Y6 studied here,…
Charge Photogeneration in Non-Fullerene Organic Solar Cells: Influence of Excess Energy and Electrostatic Interactions
Maria Saladina, Pablo Simón Marqués, Anastasia Markina +11
In organic solar cells, photogenerated singlet excitons form charge transfer (CT) complexes, which subsequently split into free charge carriers. Here, we consider the contributions…
Open-Circuit Voltage Limitation by Surface Recombination in Perovskite Solar Cells
Sebastian Reichert, Katelyn Goetz, Christopher Wöpke +2
Fundamental electronic processes such as charge-carrier transport and recombination play a critical role in determining the efficiency of hybrid perovskite solar cells. The presenc…
Charge Carrier Concentration Dependence of Encounter-Limited Bimolecular Recombination in Phase-Separated Organic Semiconductor Blends
Michael C. Heiber, Thuc-Quyen Nguyen, Carsten Deibel
Understanding how the complex intermolecular- and nano-structure present in organic semiconductor donor-acceptor blends impacts charge carrier motion, interactions, and recombinati…
Encounter-Limited Charge Carrier Recombination in Phase Separated Organic Semiconductor Blends
Michael C. Heiber, Christoph Baumbach, Vladimir Dyakonov +1
The theoretical effects of phase separation on encounter-limited charge carrier recombination in organic semiconductor blends are investigated using kinetic Monte Carlo (KMC) simul…
Nongeminate recombination in neat P3HT and P3HT:PCBM blend films
Julien Gorenflot, Michael C. Heiber, Andreas Baumann +5
The slow decay of charge carriers in polymer-fullerene blends measured in transient studies has raised a number of questions about the mechanisms of nongeminate recombination in th…
Effects of Characteristic Length Scales on the Exciton Dynamics in Rubrene Single Crystals
Björn Gieseking, Teresa Schmeiler, Benjamin Müller +4
As for its inorganic counterparts the future developments in organic electronics are driven by an advanced device miniaturization. Therefore, the opto-electronic behavior of up-to-…
Order of Decay of Mobile Charge Carriers in P3HT:PCBM Solar Cells
Carsten Deibel, Daniel Rauh, Alexander Foertig
The charge carrier dynamics of organic solar cells are strongly influenced by trapping and allow to draw conclusions on the loss mechanisms limiting the photovoltaic performance. I…
Shockley Equation Parameters of Organic Solar Cells derived by Transient Techniques
A. Foertig, J. Rauh, V. Dyakonov +1
The Shockley equation (SE), originally derived to describe a p--n junction, was frequently used in the past to simulate current--voltage (j/V) characteristics of organic solar cell…
Impact of nongeminate recombination on the performance of pristine and annealed P3HT:PCBM solar cells
Markus Gluecker, Alexander Foertig, Vladimir Dyakonov +1
Transient photovoltage (TPV) and voltage dependent charge extraction (CE) measurements were applied to poly(3-hexylthiophene)(P3HT):[6,6]-phenyl-C61 butyric acid methyl ester (PCBM…
Excitation Dynamics in Low Band Gap Donor-Acceptor Copolymers and Blends
Björn Gieseking, Berthold Jäck, Eduard Preis +5
Donor-acceptor (D-A) type copolymers show great potential for the application in the active layer of organic solar cells. Nevertheless the nature of the excited states, the couplin…
Investigation of electronic trap states in organic photovoltaic materials by current-based deep level transient spectroscopy
Stefan Neugebauer, Julia Rauh, Carsten Deibel +1
Current-based deep level transient spectroscopy was used to study trap states in poly(3- hexylthiophene-2,5-diyl) (P3HT), [6,6]-phenyl-C61 butyric acid methyl ester (PCBM) and P3HT…
Direct and charge transfer mediated photogeneration in polymer-fullerene bulk heterojunction solar cells
Markus Mingebach, Stefan Walter, Vladimir Dyakonov +1
We investigated photogeneration yield and recombination dynamics in blends of poly(3-hexyl thiophene) (P3HT) and poly[2-methoxy-5-(30,70-dimethyloctyloxy)-1,4-phenylenevinylene] (M…
Binding energy of singlet excitons and charge transfer complexes in MDMO-PPV:PCBM solar cells
Julia Kern, Sebastian Schwab, Carsten Deibel +1
The influence of an external electric field on the photoluminescence intensity of singlet excitons and charge transfer complexes is investigated for a poly[2-methoxy-5-(3',7'-dimet…
Detailed study of N,N'-(diisopropylphenyl)- terrylene-3,4:11,12-bis(dicarboximide) as electron acceptor for solar cells application
Julien Gorenflot, Andreas Sperlich, Andreas Baumann +6
We report on terrylene-3,4:11,12-bis(dicarboximide) (TDI) as electron acceptor for bulk-heterojunction solar cells using poly(3-hexyl thiophene) (P3HT) as complementary donor compo…
Relation of open circuit voltage to charge carrier density in organic bulk heterojunction solar cells
Daniel Rauh, Alexander Wagenpfahl, Carsten Deibel +1
The open circuit voltage Voc and the corresponding charge carrier density were measured in dependence of temperature and illumination intensity by current-voltage and charge extrac…
Reversible and Irreversible Interactions of Poly(3-hexylthiophene) with Oxygen Studied by Spin-Sensitive Methods
Andreas Sperlich, Hannes Kraus, Carsten Deibel +3
Understanding of degradation mechanisms in polymer:fullerene bulk-heterojunctions on the microscopic level aimed at improving their intrinsic stability is crucial for the breakthro…
Built-in potential and validity of Mott--Schottky analysis in organic bulk heterojunction solar cells
Markus Mingebach, Carsten Deibel, Vladimir Dyakonov
We investigated poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61 butyric acid methyl ester bulk heterojunction (BHJ) solar cells by means of pulsed photocurrent, temperature depend…
Triplet Exciton Generation in Bulk-Heterojunction Solar Cells based on Endohedral Fullerenes
Moritz Liedtke, Andreas Sperlich, Hannes Kraus +6
Organic bulk-heterojunctions (BHJ) and solar cells containing the trimetallic nitride endohedral fullerene 1-[3-(2-ethyl)hexoxy carbonyl]propyl-1-phenyl-Lu3N@C80 (Lu3N@C80-PCBEH) s…
Influence of Phase Segregation on Recombination Dynamics in Organic Bulk-Heterojunction Solar Cells
Andreas Baumann, Tom J. Savenije, Dharmapura Hanumantharaya K. Murthy +3
We studied the recombination dynamics of charge carriers in organic bulk heterojunction solar cells made of the blend system poly(2,5-bis(3-dodecyl thiophen-2-yl) thieno[2,3-b]thio…
First principles calculations of anisotropic charge carrier mobilities in organic semiconductor crystals
V. Stehr, J. Pfister, R. F. Fink +2
The orientational dependence of charge carrier mobilities in organic semiconductor crystals and the correlation with the crystal structure are investigated by means of quantum chem…
Photoinduced C70 radical anions in polymer:fullerene blends
Andreas Sperlich, Moritz Liedtke, Julia Kern +6
Photoinduced polarons in solid films of polymer-fullerene blends were studied by photoluminescence (PL), photoinduced absorption (PIA) and electron spin resonance (ESR). The donor…
Role of Polaron Pair Diffusion and Surface Losses in Organic Semiconductor Devices
T. Strobel, C. Deibel, V. Dyakonov
By applying Monte Carlo simulations we found that the extraction of bound polaron pairs (PP) at the electrodes is an important loss factor limiting the efficiency of organic optoel…
Oxygen doping of P3HT:PCBM blends: Influence on trap states, charge carrier mobility and solar cell performance
Julia Schafferhans, Andreas Baumann, Alexander Wagenpfahl +2
We investigated the influence of oxygen on the performance of P3HT:PCBM (poly(3-hexylthiophene):[6,6]-phenyl C61 butyric acid methyl ester) solar cells by current--voltage, thermal…