Analysis of photocurrents in lateral-geometry organic bulk heterojunction devices

Ooi, Zi En; Chan, KL; Lombardo, Christopher; Dodabalapur, Ananth

doi:10.1063/1.4739469

Cited by 19 publications

(26 citation statements)

References 20 publications

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“…Theoretical modeling of lateral BHJ devices under a large reverse voltage bias predicts space charge limited (SCL) transport behavior 11 that has been experimentally confirmed in previous studies. [12][13][14] Due to these large biases, large regions of space charge form adjacent to the electrodes even when the carrier mobilities are similar.…”

Section: Theorysupporting

confidence: 70%

“…(15) reported in Ref. 11, for the SCL photocurrent in a unipolar lateral device. The modification here arises from the extension to the ambipolar case.…”

Section: 18mentioning

confidence: 87%

“…When there is a significant difference between the carrier mobilities, one SCR becomes very small, and the device can be considered to be divided into two transport zones: SCR and RZ. Theoretical simulations of these two cases have been previously presented by Ooi et al 11 and Lombardo et al 17 These simulations are based on a device model that treats the organic BHJ as a composite semiconductor. Carriers are photogenerated homogenously across the device, independent of electric field strength.…”

Section: Theorymentioning

confidence: 99%

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Analysis of bulk heterojunction material parameters using lateral device structures

et al. 2014

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Abstract. We review the key optoelectronic properties of lateral organic bulk heterojunction (BHJ) device structures with asymmetric contacts. These structures are used to develop a detailed model of charge transport and recombination properties within materials used for organic photovoltaics. They permit a variety of direct measurement techniques, such as nonlinear optical microscopy and in situ potentiometry, as well as photoconductive gain and carrier drift length studies from photocurrent measurements. We present a theoretical framework that describes the charge transport physics within these devices. The experimental results presented are in agreement with this framework and can be used to measure carrier concentrations, recombination coefficients, and carrier mobilities within BHJ materials. Lateral device structures offer a useful complement to measurements on vertical photovoltaic structures and provide a more complete and detailed picture of organic BHJ materials. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Theorysupporting

confidence: 70%

“…(15) reported in Ref. 11, for the SCL photocurrent in a unipolar lateral device. The modification here arises from the extension to the ambipolar case.…”

Section: 18mentioning

confidence: 87%

Section: Theorymentioning

confidence: 99%

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Analysis of bulk heterojunction material parameters using lateral device structures

et al. 2014

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“…1(a)). 12 Lateral devices are of interest because they have a flat photogeneration profile that is amenable to device modeling, they allow for measurements over a wide range of transport length scales, and they enable access to the active region. This letter will demonstrate the utility of in situ potentiometry within lateral devices for evaluating BHJ materials.…”

mentioning

confidence: 99%

Bimolecular recombination coefficient calculation by in situ potentiometry in a bulk heterojunction organic photovoltaic material

Danielson¹,

Ooi²,

Lombardo³

et al. 2013

Appl. Phys. Lett.

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“…The magnitude of the photocurrent for devices with DIO is smaller than that for devices without DIO. The magnitude of the photocurrent is dependent on multiple processes including the generation rate and mobility as shown by Ooi et al in addition, it also depends on the extraction at the contacts [34]. The lower photocurrent in the sample with DIO is most likely due to less efficient collection at the electrodes.…”

Section: Resultsmentioning

confidence: 93%

Using lateral bulk heterojunctions to study the effects of additives on PTB7:PC61BM space charge regions

et al. 2015

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A B S T R A C TLateral bulk heterojunctions (LBHJ) provide a tool to directly probe the active area of photovoltaic devices using microscopy techniques. Here, we use scanning photocurrent microscopy (SPCM) to probe an organic photovoltaic (OPV) device with poly [{4,8-bis[(2-ethylhexyl)(PTB7):[6,6] phenyl-C61-butyric acid methyl ester (PC 61 BM). The effects of the additive 1,8-diiodooctane (DIO) on the recombination dynamics and morphology are probed in real space in a LBHJ structure. By using SPCM, we can see a larger increase in the space charge region for samples with DIO when compared to those without DIO. This indicates that the additive improves film morphology leading to increased charge extraction efficiency and decreased recombination.

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Analysis of photocurrents in lateral-geometry organic bulk heterojunction devices

Cited by 19 publications

References 20 publications

Analysis of bulk heterojunction material parameters using lateral device structures

Analysis of bulk heterojunction material parameters using lateral device structures

Bimolecular recombination coefficient calculation by in situ potentiometry in a bulk heterojunction organic photovoltaic material

Using lateral bulk heterojunctions to study the effects of additives on PTB7:PC61BM space charge regions

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