Soluble n-type pentacene derivatives as novel acceptors for organic solar cells

Lim, Yee‐Fun; Suo, Ying; Parkin, Sean; Anthony, John E.; Malliaras, George G.

doi:10.1039/b818693f

Cited by 104 publications

(81 citation statements)

References 28 publications

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“…Although the structure could not be resolved fully, the ADT derivative appeared to adopt a "sandwich herringbone" motif similar to that observed in some pentacene-based photovoltaic acceptors. [19][20][21] In this motif, π -stacking interactions are strictly one-dimensional, and a high mobility is not expected, in agreement with the electrical measurements presented later. The TDT derivative consistently formed low-quality single crystals, likely due to the lower symmetry compared with ADT and PDT, and only a crude model of the structure was possible.…”

Section: Doi: 101002/adma201101619supporting

confidence: 83%

Effect of Acene Length on Electronic Properties in 5‐, 6‐, and 7‐Ringed Heteroacenes

Goetz

Ward

et al. 2011

Advanced Materials

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Section: Doi: 101002/adma201101619supporting

confidence: 83%

Effect of Acene Length on Electronic Properties in 5‐, 6‐, and 7‐Ringed Heteroacenes

Goetz

Ward

et al. 2011

Advanced Materials

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“…More recently, solution-processed solar cells using soluble organic small molecules have attracted great attention for their numerous attractive features such as high molecular purity, reproducibility and scalable synthesis, tunable optoelectronic properties through structural control and high carrier mobility [17,18]. Much efforts have been devoted to design electron-donating materials for improving efficiency of solar cells, while the search for the novel acceptors is quite limited [19][20][21][22]. To develop efficient acceptor for heterojunction solar cells, one of the available approaches is the introduction of some multiple functional groups with extended absorption and high absorption coefficient, which will lead to the new acceptor possessing the characteristics of solution-processed, high light-absorbing and well charge carrier transporting ability.…”

Section: Introductionmentioning

confidence: 99%

Solution processable quinacridone based materials as acceptor for organic heterojunction solar cells

Iqbal

Zhang

Peng

et al. 2011

Solar Energy Materials and Solar Cells

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“…[26][27][28][29][30] For SMBHJs, of particular interest are solution-processable photoconductive organic semiconductors with high charge carrier mobilities and solid-state packing favoring efficient charge separation at the D/A interfaces. 31 Examples of such materials are functionalized pentacene (Pn) and anthradithiophene (ADT) derivatives which exhibit thin-film charge carrier (hole) mobilities of above $1.5 cm 2 /(Vs), fast photoresponse, high photoconductivity under continuous wave (cw) excitation, [32][33][34] and a variety of solid-state packing motifs controlled by functionalization of the molecules. 35 Investigation of mechanisms of charge photogeneration and transport in such materials and their D/A composites is the focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

Charge carrier dynamics in organic semiconductors and their donor-acceptor composites: Numerical modeling of time-resolved photocurrent

Johnson

Kendrick

Ostroverkhova

2013

Journal of Applied Physics

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We present a model that describes nanosecond (ns) time-scale photocurrent dynamics in functionalized anthradithiophene (ADT) films and ADT-based donor-acceptor (D/A) composites. By fitting numerically simulated photocurrents to experimental data, we quantify contributions of multiple pathways of charge carrier photogeneration to the photocurrent, as well as extract parameters that characterize charge transport (CT) in organic films including charge carrier mobilities, trap densities, hole trap depth, and trapping and recombination rates. In pristine ADT films, simulations revealed two competing charge photogeneration pathways: fast, occurring on picosecond (ps) or sub-ps time scales with efficiencies below 10%, and slow, which proceeds at the time scale of tens of nanoseconds, with efficiencies of about 11%–12%, at the applied electric fields of 40–80 kV/cm. The relative contribution of these pathways to the photocurrent was electric field dependent, with the contribution of the fast process increasing with applied electric field. However, the total charge photogeneration efficiency was weakly electric field dependent exhibiting values of 14%–20% of the absorbed photons. The remaining 80%–86% of the photoexcitation did not contribute to charge carrier generation at these time scales. In ADT-based D/A composites with 2 wt.% acceptor concentration, an additional pathway of charge photogeneration that proceeds via CT exciton dissociation contributed to the total charge photogeneration. In the composite with the functionalized pentacene (Pn) acceptor, which exhibits strong exciplex emission from a tightly bound D/A CT exciton, the contribution of the CT state to charge generation was small, ∼8%–12% of the total number of photogenerated charge carriers, dependent on the electric field. In contrast, in the composite with PCBM acceptor, the CT state contributed about a half of all photogenerated charge carriers. In both D/A composites, the charge carrier mobilities were reduced and trap densities and average trap depths were increased, as compared to a pristine ADT donor film. A considerably slower recombination of free holes with trapped electrons was found in the composite with the PCBM acceptor, which led to slower decays of the transient photocurrent and considerably higher charge retention, as compared to a pristine ADT donor film and the composite with the functionalized Pn acceptor.

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Soluble n-type pentacene derivatives as novel acceptors for organic solar cells

Cited by 104 publications

References 28 publications

Effect of Acene Length on Electronic Properties in 5‐, 6‐, and 7‐Ringed Heteroacenes

Effect of Acene Length on Electronic Properties in 5‐, 6‐, and 7‐Ringed Heteroacenes

Solution processable quinacridone based materials as acceptor for organic heterojunction solar cells

Charge carrier dynamics in organic semiconductors and their donor-acceptor composites: Numerical modeling of time-resolved photocurrent

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