2009
DOI: 10.1002/adma.200901114
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Correlation of Heterojunction Luminescence Quenching and Photocurrent in Polymer‐Blend Photovoltaic Diodes

Abstract: Charge generation in organic solar cells proceeds via photogeneration of excitons in the bulk that form geminate electron–hole pairs at the heterojunction formed between electron donor and acceptors. It is shown that an externally applied electric field increases the number of free charges formed from the geminate pair, and quenches the luminescence from the relaxed exciplex with one‐to‐one correspondence.

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Cited by 38 publications
(46 citation statements)
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References 32 publications
(28 reference statements)
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“…This leads us to conclude that the increase in photo-current generation in the more fi ne-grained regions is more likely to result from an improved dissociation effi ciency of the resultant polaron pairs into free charges. [ 36 ] Here, we assume comparable charge-transport and thus charge-extraction characteristics since the blend mobility is not found to be affected by the observed variation in phase separation. [ 37 ] Having established that the variations in photocurrent generation across spin-coated thin fi lms of TQ1:PC 71 BM largely arise from changes in BHJ nanostructure, we used in situ refl ectance imaging with the aim to better understand the underlying cause that gives rise to these morphologies.…”
Section: C)mentioning
confidence: 99%
“…This leads us to conclude that the increase in photo-current generation in the more fi ne-grained regions is more likely to result from an improved dissociation effi ciency of the resultant polaron pairs into free charges. [ 36 ] Here, we assume comparable charge-transport and thus charge-extraction characteristics since the blend mobility is not found to be affected by the observed variation in phase separation. [ 37 ] Having established that the variations in photocurrent generation across spin-coated thin fi lms of TQ1:PC 71 BM largely arise from changes in BHJ nanostructure, we used in situ refl ectance imaging with the aim to better understand the underlying cause that gives rise to these morphologies.…”
Section: C)mentioning
confidence: 99%
“…It is noted that geminate and biomolecular recombination will compete in an OPV to some extent and consequently it is possible that geminate carriers which have separated by less than 25 nm, and so would be considered Coulombically bound by the above definition, may recombine biomolecularly. However, since geminate recombination appears to be the major loss mechanism in some OPVs, 4,[19][20][21] and that competition between geminate and bimolecular recombination ought to be viewed in a device context, we here consider geminate recombination as a standalone process. Returning to the simulations, at the end of each trial the energetic disorder is rechosen from the same distribution before being run again with a new geminate charge pair.…”
Section: Simulation Methodologymentioning
confidence: 99%
“…This balance of capabilities is particularly appropriate to OPVs and has already been used to show the effect of morphology on open-circuit voltage, short-circuit current, and device efficiency. 14-17 MMC models are able to reproduce key findings of experimental data including, for example, the Poole-Frenkel type electric field dependence of carrier mobility, 15 the importance of geminate recombination [14][15][16]18 as seen in polymer-polymer 4,19 and polymer-fullerene 20,21 OPVs, and the effect of morphology on OPV performance [14][15][16]22 as reported widely in experiment. 8 Furthermore, MMC models have allowed close examination of important aspects of OPV performance such as geminate [22][23][24][25] and bimolecular 15,26 recombination, mobility, 27 and exciton dissociation.…”
Section: Introductionmentioning
confidence: 96%
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“…In the last two decades, various functions of plastic devices have been demonstrated, including polymer light-emitting diodes (PLEDs) [4,5] for commercial flat panel displays and white solid lighting sources, polymer solar cells (PSCs) [6,7], polymer thin-film transistors [8][9][10][11], polymer lasers [12][13][14][15], polymer photodetectors [16][17][18][19], polymer memory for information storage [20][21][22][23][24][25] and others [26][27][28]. In this area, the basic open question pertaining to commercialization is to fabricate low-cost, stable and high-performance thin-film devices.…”
Section: Introductionmentioning
confidence: 99%