Organic solar cells based on anthracene-containing PPE–PPVs and non-fullerene acceptors

Alam, Shahidul; Meitzner, Rico; Nwadiaru, Ogechi Vivian; Friebe, Christian; Cann, Jonathan; Ahner, Johannes; Ulbricht, Christoph; Kan, Zhipeng; Höppener, Stephanie; Hager, Martin D.; Egbe, Daniel Ayuk Mbi; Welch, Gregory C.; Laquai, Frédéric; Schubert, Ulrich S.; Hoppe, Harald

doi:10.1007/s11696-018-0466-y

Cited by 7 publications

(10 citation statements)

References 38 publications

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“…Note that upon a reduction of the recombination coefficient by a factor of 10, the apparent field‐dependence is strongly attenuated as can be seen from Figure S5, Supporting Information (parameter set D). This is well in line with examples from literature that showed almost no field‐dependence for certain absorber materials as the recombination coefficients in these systems were (when indicated) usually substantially lower compared to those materials where a rather strong field‐dependence was found …”

Section: Measurement Principle Of Tdcfsupporting

confidence: 90%

“…This is interpreted as to result from a field‐dependent generation of charge carriers. There are numerous examples in literature, and although the results are often similar to the ones shown in Figure there are also cases where the extracted charge does hardly depend on V pre . When analyzing these publications in terms of charge carrier mobility and bimolecular recombination coefficient (note that these quantities are however not reported in all of the studies) it is striking that the field‐dependence is particularly pronounced for low charge carrier mobilities and large recombination coefficients.…”

Section: Measurement Principle Of Tdcfmentioning

confidence: 58%

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Apparent Field‐Dependence of the Charge Carrier Generation in Organic Solar Cells as a Result of (Bimolecular) Recombination

Würfel

Unmüssig

2018

Solar RRL

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Charge carrier generation in organic solar cells is often reported to depend on the electric field. This is, however, not measured directly but derived from transient charge carrier extraction experiments based on the time delayed collection field (TDCF) method. In this work, numerical simulations of TDCF experiments are presented which – when analyzed in the same way as reported in literature – result in a field‐dependence of charge carrier generation despite the fact that a field‐independent generation is used. This discrepancy is shown to be caused by recombination of photogenerated charge carriers occurring in the time range prior to and during extraction. This apparent field‐dependence becomes more pronounced for larger recombination coefficients and decreasing charge carrier mobilities, very much in accordance with experimental TDCF data from literature. Even an apparent voltage‐ and time‐dependence of the bimolecular recombination coefficient is reproduced in the simulations although a constant, voltage‐independent one is used. These findings strongly question whether TDCF is an appropriate method to detect a potential field‐dependence of the photocurrent generation and the recombination coefficient. Our study shows that all experimental results can consistently be explained without the assumption of a field‐dependence of the charge carrier generation and the bimolecular recombination coefficient.

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Section: Measurement Principle Of Tdcfsupporting

confidence: 90%

Section: Measurement Principle Of Tdcfmentioning

confidence: 58%

Apparent Field‐Dependence of the Charge Carrier Generation in Organic Solar Cells as a Result of (Bimolecular) Recombination

Würfel

Unmüssig

2018

Solar RRL

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“…Unfortunately, the combination of AnE-PVstat:ITIC failed, and OSCs prepared from the same were strongly limited in photocurrent, which was related to insufficient generation and increased recombination of charges 62 . Since the absorption of the ITIC covers large parts of the polymer emission spectrum 63 , Förster resonance energy transfer (FRET) [64][65][66] could theoretically be part of the reason for a strong reduction in photocurrent; however, even for the photovoltaically successful archetypical blend of PBDB-T and ITIC, the polymer emission directly overlaps with ITIC absorption, nevertheless resulting in successful photocurrent generation.…”

Section: Figure 3: Common Understanding Of the Energy Landscape At A ...mentioning

confidence: 99%

“…In this section, charge generation and recombination for the two photovoltaic blend couples of AnE-PVstat:PC60BM and AnE-PVstat:ITIC are explored by a number of established characterization techniques in order to elucidate distinct differences and to find a proper explanation for the insufficient performance of the latter of the two. So far, it became evident that the main limitation of the AnE-PVstat:ITIC blend is connected to minimal charge generation (see, e.g., IV and EQE above as well as TDCF 62 ). Hence a confirmation by more fundamental techniques like electron spin resonance (ESR), optically detected magnetic resonance (ODMR), and transient absorption (TA) was pursued.…”

Section: Charge Generation and Recombination Processesmentioning

confidence: 99%

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

et al. 2021

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“…Poly(phenylenevinylene) (PPV) and its derivatives have attracted considerable attention because of their remarkable optical and electronic properties. It is well known that after the discovery of the optoelectronic properties of PPVs, especially the electroluminescence, , these materials have been exploited as an active layer in organic light-emitting diodes (OLEDs) − and other applications such as laser dyes, − photovoltaic cells, − chemosensors, − linkers for metal–organic frameworks (MOFs), − dendrimers, − photoredox catalysts, and photosensitizers. − The synthesis of PPVs frequently presents challenges as it leads to a mixed cis/trans-configuration over the vinyl segments of the polymeric structure; they show large dimensions and poor solubility in a wide range of solvents …”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Time-Dependent DFT Study of the Photophysical Properties of Substituted 1,4-Distyrylbenzenes

et al. 2019

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In this contribution, we examine the photophysical properties of 15 totally trans–trans 1,4-distyrylbenzene derivatives (DSBs) functionalized with different electron-donating (ED) and electron-withdrawing (EW) groups by experimental and computational methodologies. We use UV–vis and fluorescence spectroscopies to determine the experimental optical properties such as the maximum absorption (λabs exp) and emission (λem exp) wavelengths, the highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gaps (ΔE abs exp), the molar extinction coefficients (ε), the fluorescence quantum yields (Φf), and the fluorescence lifetimes (τ). We also calculate the experimental spontaneous emission decay rate (k r exp) and correlate all of these magnitudes to the corresponding calculated properties, maximum absorption (λabs cal) and emission (λem cal) wavelengths, vertical transition energies (ΔE abs cal), oscillator strength (F osc), and spontaneous emission decay rate (k r cal), obtained by the time-dependent density functional theory method. We analyze the effect of the electronic nature of the substituents on the properties of the DSBs, finding that the ED and EW groups lead to bathochromic shifts. This is consistent with the decrease of ΔE values as the strength of ED and EW substituents increases. We find excellent correlations between calculated and experimental values for λabs, λem, and ΔE abs (r ∼ 0.99–0.95). Additionally, the correlations between the relative ε with F osc values and the k r values are in good agreement (r ∼ 0.88–0.72) with the experimental properties. Overall, we find that for substituted 1,4-DSBs, computational chemistry is an excellent tool to predict structure–property relationships, which can be useful to forecast the properties of their polymeric analogues, which are usually difficult to determine experimentally.

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Organic solar cells based on anthracene-containing PPE–PPVs and non-fullerene acceptors

Cited by 7 publications

References 38 publications

Apparent Field‐Dependence of the Charge Carrier Generation in Organic Solar Cells as a Result of (Bimolecular) Recombination

Apparent Field‐Dependence of the Charge Carrier Generation in Organic Solar Cells as a Result of (Bimolecular) Recombination

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

Spectroscopic and Time-Dependent DFT Study of the Photophysical Properties of Substituted 1,4-Distyrylbenzenes

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