Charge Transfer and Charge Separation in Conjugated Polymer Solar Cells

Howard, Ian A.; Abrusci, Agnese; Friend, Richard H.; Westenhoff, Sebastian

doi:10.1002/9780470661338.ch13

Cited by 2 publications

(2 citation statements)

References 117 publications

(207 reference statements)

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“…However, next to creating charges by using triplet excited states, also the reverse process, the formation of triplet states from charges has gained a lot of interest, especially in recent investigations of organic thin film blends that relate to photovoltaic materials. [7][8][9] Various reports on these matters state that there is no clarity regarding the mechanistic aspects of this loss channel in organic photovoltaic materials, [10][11][12] especially when occurring on a subnanosecond timescale.…”

Section: Introductionmentioning

confidence: 99%

Making triplets from photo-generated charges: observations, mechanisms and theory

Gibbons

Farawar

Mazzella

et al. 2020

Photochem Photobiol Sci

127

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Section: Introductionmentioning

confidence: 99%

Making triplets from photo-generated charges: observations, mechanisms and theory

Gibbons

Farawar

Mazzella

et al. 2020

Photochem Photobiol Sci

127

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“…Sub-ns timescale charge loss through triplet recombination channels in polymer solar cell materials has also gained a lot of interest in the last years [17]. Furthermore, it is important to note that in a recent report, Howard et al stated that currently there is no insight into the exact mechanism of charge recombination to the triplet state [18].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Charge and Triplet State Formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State

Williams

Chen

Nuzzo

et al. 2017

Journal of Spectroscopy

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Femtosecond transient absorption spectroscopy of thin films of two types of morphologies of diketopyrrolopyrrole low band gap polymer/fullerene-adduct blends is presented and indicates triplet state formation by charge recombination, an important loss channel in organic photovoltaic materials. At low laser fluence (approaching solar intensity) charge formation characterized by a 1350 nm band (in ~250 fs) dominates in the two PDPP-PCBM blends with different nanoscale morphologies and these charges recombine to form a local polymer-based triplet state on the sub-ns timescale (in ~300 and ~900 ps) indicated by an 1100 nm absorption band. The rate of triplet state formation is influenced by the morphology. The slower rate of charge recombination to the triplet state (in ~900 ps) belongs to a morphology that results in a higher power conversion efficiency in the corresponding device. Nanoscale morphology not only influences interfacial area and conduction of holes and electrons but also influences the mechanism of intersystem crossing (ISC). We present a model that correlates morphology to the exchange integral and fast and slow mechanisms for ISC (SOCT-ISC and H-HFI-ISC). For the pristine polymer, a flat and unstructured singlet-singlet absorption spectrum (between 900 and 1400 nm) and a very minor triplet state formation (5%) are observed at low laser fluence.

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Charge Transfer and Charge Separation in Conjugated Polymer Solar Cells

Cited by 2 publications

References 117 publications

Making triplets from photo-generated charges: observations, mechanisms and theory

Making triplets from photo-generated charges: observations, mechanisms and theory

Ultrafast Charge and Triplet State Formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State

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