Enhanced charge separation in organic photovoltaic films doped with ferroelectric dipoles

Nalwa, Kanwar Singh; Carr, Jack; Mahadevapuram, Rakesh C.; Kodali, Hari Krishna; Bose, Sayantan; Chen, Yuqing; Petrich, Jacob W.; Ganapathysubramanian, Baskar; Chaudhary, Sumit

doi:10.1039/c2ee03478f

Cited by 111 publications

(104 citation statements)

References 31 publications

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“…Considering that the SLs with free carriers inside can act as electrodes for poling, only the dimension of such SLs determines the V c ( ¼ E c d f ). The f in dc devices with small dimensional ferroelectric components, such as the OPV devices in previous reports 14,15 , may be sufficient for poling. As shown in Supplementary Note 1 and Supplementary Fig.…”

Section: Discussionmentioning

confidence: 99%

“…All of these, as well as the random distributed local field 14 , can play significant roles in the device operating in transient mode. Unlike the field caused by f, the oriented local E s is independent of d f , and even thick devices with small capacitance can also show significant photoresponse.…”

Section: Discussionmentioning

confidence: 99%

“…Effective exciton dissociation requires a field of 50-70 MV m À 1 (ref. 14), which is much larger than that induced by a conventional electrode potential difference (typically 1-10 MV m À 1 ). A recent attempt 15 has been made to utilize the 'strong' net electric field from poled ferroelectric poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) monolayers at electrode interfaces to improve exciton dissociation in OPV devices, despite the fact that the introduction of an organic semiconductor with a low permittivity must induce a large depolarization field (E d ) [16][17][18] if there are not enough charges injected for compensation/screening during poling.…”

mentioning

confidence: 99%

“…It was argued that the resultant enhancement originates from chemical reactions at the electrode interfaces that can modify the work function of the electrodes 19 . More recently, OPV devices with unpoled P(VDF-TrFE) as an additive also showed an enhancement of conversion efficiency 14 . Strong local fields were proposed to be responsible for this improvement.…”

mentioning

confidence: 99%

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Storage of an electric field for photocurrent generation in ferroelectric-functionalized organic devices

Dalgleish

Matsushita

et al. 2014

Nat Commun

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Organic optoelectronic devices are usually driven by the electric field generated from an electrode potential difference or bias voltage. Although poled ferroelectric domains may produce oriented stray fields, few efforts have been made to utilize them for photocurrent generation in organic devices. Here we show that large net fields caused by incomplete screening during ferroelectric polarization, and which can be 'restored' by short voltage pulses, can facilitate exciton dissociation in organic semiconductors. The oriented fields, comparable with that produced by an electrode potential difference (1B10 MV m À 1 ), here are found to be responsible for the photocurrent in our devices. A prototype for an organic photodetector driven by such stray fields is demonstrated. The photoresponsivity, without any optimization, can achieve B0.1 mA W À 1 . This study provides a different operation principle for the generation of photocurrent in organic optoelectronic devices. Furthermore, the polarity-tunable photoresponse may lead to new photoresponsive memory devices.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Storage of an electric field for photocurrent generation in ferroelectric-functionalized organic devices

Dalgleish

Matsushita

et al. 2014

Nat Commun

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“…Thus, combination ferroelectrics with other materials and designing devices based on these combinations became an important research venue. Various setups have been considered, such as multilayer structures consisting of ferroelectric materials and semiconductor materials [34,[60][61][62][63][64][65][66].…”

Section: Combination With Various Materialsmentioning

confidence: 99%

Applications of ferroelectrics in photovoltaic devices

et al. 2016

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Ferroelectric materials exhibiting anomalous photovoltaic properties are one of the foci of photovoltaic research. We review the foundations and recent progress in ferroelectric materials for photovoltaic applications, including the physics of ferroelectricity, nature of ferroelectric thin films, characteristics and underlying mechanism of the ferroelectric photovoltaic effect, solar cells based on ferroelectric materials, and other related topics. These findings have important implications for improving the efficiency of photovoltaic cells.

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Scanning Probe Microscopy of Functional Materials Surfaces and Interfaces

Sharma

Seidel

2016

Advanced Materials Interfaces

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Enhanced charge separation in organic photovoltaic films doped with ferroelectric dipoles

Cited by 111 publications

References 31 publications

Storage of an electric field for photocurrent generation in ferroelectric-functionalized organic devices

Storage of an electric field for photocurrent generation in ferroelectric-functionalized organic devices

Applications of ferroelectrics in photovoltaic devices

Scanning Probe Microscopy of Functional Materials Surfaces and Interfaces

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