Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence

Gerhard, Marina; Gehrig, Dominik; Howard, Ian A.; Arndt, Andreas P.; Bilal, Mühenad; Rahimi‐Iman, Arash; Lemmer, Uli; Laquai, Frédéric; Koch, Martin

doi:10.1117/12.2227672

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…Apparently, a longer lifetime of Y6 exciton (τ pure ) would increase the exciton dissociation efficiency of Y6 in the blend film. We note that the exciton lifetime of Y6 film (0.8 ns) is longer than many classical small molecular acceptors, such as ITIC (0.524 ns) [38], PDI-(1, 2, 3) (<0.7 ns) [39], IDTTBM (0.097 ns) [40], as well as classical polymer acceptors N2200 (~0.059 ns) [37]. The relatively long exciton lifetime of Y6 film would be helpful for the exciton diffusion and dissociation of Y6 in the blend film.…”

Section: Excited State Properties Of Y6 Solution and Filmmentioning

confidence: 80%

An Insight into the Excitation States of Small Molecular Semiconductor Y6

Zou

Wen

et al. 2020

Molecules

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Y6 is a new type of non-fullerene acceptor, which has led to power conversion efficiencies of single-junction polymer solar cells over 17% when combined with a careful choice of polymeric donors. However, the excited state characteristics of Y6, which is closely correlated with its opto-electronic applications, are not clear yet. In this work, we studied the excited state properties of the Y6 solution and Y6 film, by using steady-state and time-resolved spectroscopies as well as time-dependent density functional theory (TD-DFT) calculations. UV-Vis absorption and fluorescence simulation, natural transition orbitals (NTOs) and hole-electron distribution analysis of Y6 solution were performed for understanding the excitation properties of Y6 by using TD-DFT calculations. The lifetimes of the lowest singlet excited state in Y6 solution and film were estimated to be 0.98 and 0.8 ns, respectively. Combining the exciton lifetime and photoluminescence (PL) quantum yield, the intrinsic radiative decay lifetimes of Y6 in the solution and film were estimated, which were 1.3 and 10.5 ns for the Y6 solution and film, respectively. Long exciton lifetime (~0.8 ns) and intrinsic radiative decay lifetime (~10.5 ns) of Y6 film enable Y6 to be a good acceptor material for the application of polymer solar cells.

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Section: Excited State Properties Of Y6 Solution and Filmmentioning

confidence: 80%

An Insight into the Excitation States of Small Molecular Semiconductor Y6

Zou

Wen

et al. 2020

Molecules

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“…[1][2][3][4][5] Recently, lots of attentions are focused on charge-transfer states (CTSs) and their roles on photovoltaic process. [6][7][8][9][10][11][12][13][14] Specifically, the relationship between CTSs and open-circuit voltage (V OC ) of OPV devices has been widely discussed.…”

Section: Introductionmentioning

confidence: 99%

Charge-Transfer State Energy and Its Relationship with Open-Circuit Voltage in an Organic Photovoltaic Device

Guan

Cheng

et al. 2016

J. Phys. Chem. C

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Charge-transfer state (CTS) plays a very important role in organic photovoltaic (OPV) devices. Especially the relationship between open-circuit voltage (V OC ) and CTS has been widely discussed. It is proposed that the CTS energy (E CT ) directly determines the V OC value, however, the E CT s measured from different techniques often show considerable discrepancy.Here four methods are applied to probe the E CT values in five different bulk-heterojunction polymer:fullerene OPVs. It is found that linear relationships exists between different E CT s and V OC values. The detailed energetic meanings of the E CT values measured from different techniques are discussed and the origin of their discrepancy is analyzed. Lastly, based on a proposed energy model, a relationship is summarized to estimate V OC loss by considering the energetic broadening of CTS, bimolecular recombination and dielectric effect. The results provide a guideline to forecast the V OC and investigate its loss in OPV.

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Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence

Cited by 2 publications

References 27 publications

An Insight into the Excitation States of Small Molecular Semiconductor Y6

An Insight into the Excitation States of Small Molecular Semiconductor Y6

Charge-Transfer State Energy and Its Relationship with Open-Circuit Voltage in an Organic Photovoltaic Device

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