Origin of poor photovoltaic performance of bis(tetracyanoantrathiophene) non-fullerene acceptor

Kobeleva, Elena S.; Popov, Alexander; Baranov, Denis S.; Uvarov, Mikhail N.; Nevostruev, Danil A.; Degtyarenko, K. M.; Gadirov, R. M.; Sukhikh, A. S.; Кулик, Л. В.

doi:10.1016/j.chemphys.2021.111162

Cited by 6 publications

(12 citation statements)

References 58 publications

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“…The out-of-phase “difference” echo-detected EPR spectrum in Figure 2 was a single line, similar to that for other organic photovoltaic composites [ 42 , 43 ]. This observation implies that the mechanism of charge photogeneration in the P3HT/s-SWCNT composite is similar to that for common polymer/fullerene and polymer/non-fullerene acceptor composites.…”

Section: Resultssupporting

confidence: 71%

“…Since the s-SWCNT acts as a template for the P3HT, we suggest that the influence of the substrate on the aggregation of the s-SWCNT and the P3HT in films is moderate. The insensitivity of the CTS geometry to the substrate and the film deposition method was recently shown for the composite of a donor polymer with a non-fullerene acceptor by direct comparison of OOP ESEEM traces [ 43 ]. We also suggest that the structure of CTS at 30 K (the temperature of our ESE experiments) and at room temperature (the typical temperature of solar cell operation) are similar.…”

Section: Resultsmentioning

confidence: 99%

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Fast Recombination of Charge-Transfer State in Organic Photovoltaic Composite of P3HT and Semiconducting Carbon Nanotubes Is the Reason for Its Poor Photovoltaic Performance

Uvarov

Kobeleva

Degtyarenko

et al. 2023

IJMS

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Although the photovoltaic performance of the composite of poly-3-hexylthiophene (P3HT) with semiconducting single-walled carbon nanotubes (s-SWCNT) is promising, the short-circuit current density jSC is much lower than that for typical polymer/fullerene composites. Out-of-phase electron spin echo (ESE) technique with laser excitation of the P3HT/s-SWCNT composite was used to clarify the origin of the poor photogeneration of free charges. The appearance of out-of-phase ESE signal is a solid proof that the charge-transfer state of P3HT+/s-SWCNT− is formed upon photoexcitation and the electron spins of P3HT+ and s-SWCNT− are correlated. No out-of-phase ESE signal was detected in the same experiment with pristine P3HT film. The out-of-phase ESE envelope modulation trace for P3HT/s-SWCNT composite was close to that for the polymer/fullerene photovoltaic composite PCDTBT/PC70BM, which implies a similar distance of initial charge separation in the range 2–4 nm. However, out-of-phase ESE signal decay with delay after laser flash increase for P3HT/s-SWCNT composite was much faster, with a characteristic time of 10 µs at 30 K. This points to the higher geminate recombination rate for the P3HT/s-SWCNT composite, which may be one of the reasons for the relatively poor photovoltaic performance of this system.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Fast Recombination of Charge-Transfer State in Organic Photovoltaic Composite of P3HT and Semiconducting Carbon Nanotubes Is the Reason for Its Poor Photovoltaic Performance

Uvarov

Kobeleva

Degtyarenko

et al. 2023

IJMS

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“…This is necessary for measuring the relatively weak ESE signal of the CT state without distortion. Generally, the procedure of the experiment was close to that in our previous studies of OPV composites by pulse EPR technique [12,34] .…”

Section: Methodsmentioning

confidence: 65%

“…Therefore, the light-induced EPR signal is directly related to the molecular structure of the donor and acceptor and their aggregation behavior, and the degree of structural disorder in the blend film. Continuous wave (CW) light-induced EPR can be used to study the non-geminate (bulk) recombination of the photogenerated charges in organic photovoltaic (OPV) composites [11][12][13]. Time-resolved (TR) EPR can be used to probe the CT state in donor-acceptor composites [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Structure of the Charge-Transfer State in PM6/Y6 and PM6/Y6:YT Composites Studied by Electron Spin Echo Technique

et al. 2023

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Nowadays, Y-shaped non-fullerene acceptors become increasingly important in organic photovoltaics (OPV). Their use in binary and ternary bulk heterojunction composites continuously pushes up the efficiency of OPV devices. However, the mechanism of OPV performance enhancement by the third component of a ternary composite is rarely understood. In the present work, pulse EPR technique was used to reveal the similarities and the differences of photoinduced charge separation process in binary PM6/Y6 and ternary PM6/Y6:Y-T composites, where PM6 is polymer donor, Y6 and Y-T are different non-fullerene acceptors. Out-of-phase electron spin echo signal was detected for both composites, which is the signature of the charge-transfer state (CT state) formed at the donor/acceptor interface upon exciton splitting. Nearly identical distribution of the distances between the electron and the hole constituting the CT state was obtained for these composites from the analysis of this signal. In both cases the average electron-hole distance was 3.5 nm. It implies that OPV efficiency increase with Y-T addition is not caused by the increased probability of CT state dissociation followed by free charge generation for PM6/Y6:Y-T composite.

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“…For the HP crystal at a given temperature, its surface energy for per molecular unit can be considered to be definite. For the HP solution in a given solvent at a given temperature, its specific surface energy is smaller than that of its corresponding HP crystals and correlated with Growth temperature [°C] >1400 [35] >450 [36] >1100 [37] >500 [38] ≈100 [39] ≈150 [40] Bandgap [eV] 1.1-1.3 [41] 1.42 [42] 1.45 [43] 1.04-1.7 [44] 1.42-2.4 [39,[45][46][47] 1.2-3.0 [48] Absorption coefficient [cm −1 ] 10 3 to 10 4 [49][50][51] 10 4 to 10 5 [49][50][51] 10 4 to 10 5 [49][50][51] 10 4 to 10 5 [49][50][51] 10 4 to 10 5 [46] 10 4 to 10 5 [49][50][51] Electron/hole mobility [cm 2 V −1 s −1 ] 1500 [52] /500 [53] 8000/320 [54] 1090/110 [55] 100/25 [56] 10 −4 /10 −6 [47] 33/55 [57] Trap density [cm −3 ] 10 12 [58] 10 12 to 10 14 [59] 10 15 [60] 10 13 [38] 10 15 [45] 10 8 to 10 13 [17,…”

Section: Homogenous Nucleationmentioning

confidence: 99%

Halide Perovskite Crystallization Processes and Methods in Nanocrystals, Single Crystals, and Thin Films

Gao

Chen

et al. 2022

Advanced Materials

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Halide perovskite semiconductors with extraordinary optoelectronic properties have been fascinatedly studied. Halide perovskite nanocrystals, single crystals, and thin films have been prepared for various fields, such as light emission, light detection, and light harvesting. High‐performance devices rely on high crystal quality determined by the nucleation and crystal growth process. Here, the fundamental understanding of the crystallization process driven by supersaturation of the solution is discussed and the methods for halide perovskite crystals are summarized. Supersaturation determines the proportion and the average Gibbs free energy changes for surface and volume molecular units involved in the spontaneous aggregation, which could be stable in the solution and induce homogeneous nucleation only when the solution exceeds a required minimum critical concentration (Cmin). Crystal growth and heterogeneous nucleation are thermodynamically easier than homogeneous nucleation due to the existent surfaces. Nanocrystals are mainly prepared via the nucleation‐dominated process by rapidly increasing the concentration over Cmin, single crystals are mainly prepared via the growth‐dominated process by keeping the concentration between solubility and Cmin, while thin films are mainly prepared by compromising the nucleation and growth processes to ensure compactness and grain sizes. Typical strategies for preparing these three forms of halide perovskites are also reviewed.

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Origin of poor photovoltaic performance of bis(tetracyanoantrathiophene) non-fullerene acceptor

Cited by 6 publications

References 58 publications

Fast Recombination of Charge-Transfer State in Organic Photovoltaic Composite of P3HT and Semiconducting Carbon Nanotubes Is the Reason for Its Poor Photovoltaic Performance

Fast Recombination of Charge-Transfer State in Organic Photovoltaic Composite of P3HT and Semiconducting Carbon Nanotubes Is the Reason for Its Poor Photovoltaic Performance

Structure of the Charge-Transfer State in PM6/Y6 and PM6/Y6:YT Composites Studied by Electron Spin Echo Technique

Halide Perovskite Crystallization Processes and Methods in Nanocrystals, Single Crystals, and Thin Films

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