Hybrid Organic/PbS Quantum Dot Bilayer Photodetector with Low Dark Current and High Detectivity

Wei, Yuanzhi; Ren, Zhenwei; Zhang, Andong; Mao, Peng; Li, Hui; Zhong, Xinhua; Li, Weiwei; Yang, Shuqiang; Wang, Jizheng

doi:10.1002/adfm.201706690

Cited by 159 publications

(146 citation statements)

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“…Compared to inorganic photodetectors, the OPDs usually exhibit relatively slow response speed, which can be typically attributed to i) the organic semiconductor materials with low charge carrier mobility, and ii) the rather long RC‐time in these devices since the junctions are normally very thin and therefore they have high capacitance . In the future, by combining the advantages of both organic semiconductor materials (facile solution processing) and inorganic semiconductor materials (high charge carrier mobility), the organic–inorganic hybrid photodetectors are expected to achieve special wavelength detection and exhibit excellent performance . In addition, the multifunctional OPDs can overcome the limitation of single functional model and meet the need of versatility in practical application, extending their application filed .…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Photomultiplication Type Organic Photodetectors

Miao

Zhang

2018

Laser & Photonics Reviews

222

182

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Photodetectors as a significant unit of intelligent optoelectronic systems have stimulated immense attention from multidisciplinary areas. Photomultiplication (PM) is desirable for sensitive photodetectors with strong detection capability of weak light, which can further simplify the photo‐detection systems without pre‐amplifier circuit. For organic photodetectors (OPDs), PM phenomenon cannot be realized by utilizing the principle of avalanche effect or impact ionization as in inorganic materials, stemming from organic semiconductor materials with large exciton binding energy and disordered structure. In this review, the recent progress on PM type OPDs is comprehensively summarized from the perspective of device physics and material science. Charge tunneling injection induced by interfacial traps becomes the mainstream working mechanism for obtaining PM phenomenon. A series of PM type OPDs was achieved by utilizing interfacial blocking layer and introducing trap states into active layer or interfacial layer. The filter‐free PM type narrowband OPDs are realized by combining the concept of charge injection narrowing with the mechanism of PM. Meanwhile, further development on this hot topic is proposed and fully discussed, including multifunctional OPDs, organic–inorganic hybrid photodetectors, and photodetector systems.

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Section: Introductionmentioning

confidence: 99%

Recent Progress on Photomultiplication Type Organic Photodetectors

Miao

Zhang

2018

Laser & Photonics Reviews

222

182

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“…By using femtosecond transient absorption spectroscopy, they confirmed that there was efficient charge transfer between the MoS 2 and the g‐C 3 N 4 . Wei et al fabricated hybrid bilayer PDs constructed from a PbS QDs film and an organic blend film which was composed of poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐ alt ‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2'‐c:4′,5′‐c′]dithiophene‐4,8‐dione))] (PBDB‐T) as donor and the porphyrin molecule PBI‐Por as acceptor (see Figure e,f) . Benefiting from the well‐aligned energy levels, the photogenerated electrons and holes could be transported separately, leading to high I p , and the depletion region formed by the two layers would reduce I d .…”

Section: Performance Improvement Strategiesmentioning

confidence: 99%

Section: Performance Improvement Strategiesmentioning

confidence: 99%

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Lin

Wang

2019

Advanced Materials

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Since the device performance mainly depends on the active materials and device architectures, they are the subject of extensive work, and there have been many achievements. Dispersible inorganic materials vastly simplify the preparation of films while maintaining good electrical conductivity; [1][2][3][4][5] organic small-molecule materials and polymer materials have wide wavelength response, especially in visible region, and can be adjusted easily by changing the functional groups; [6][7][8][9][10] organic-inorganic hybrid material systems are also a promising development direction, combining good electrical and optical properties; [11][12][13][14][15] in addition, the perovskite series of organic-inorganic hybrid materials has become a new research direction due to their excellent optoelectronic properties. [16][17][18][19][20] In addition, varieties of microstructures including nanoparticles, nanowires, nanosheets etc., have been widely investigated, and they have a wide range of applications in devices benefiting from their peculiar characteristics, like quantum size effect and anisotropy. [21][22][23][24][25] Besides working on active materials, constructing diverse device architectures is also a convenient and effective approach. [26][27][28][29][30] The fabrication of blend, bilayer, and multilayer architectures would be conducive to increasing responsivity, extending detection range, and accelerating response speed.Here, from active materials to device architectures, we systematically introduce and discuss the strategies for improving the device performance of solution-processed lateral PDs. To begin with, we briefly expound the working mechanism of the lateral PDs and clarify the key device figures-of-merit. Then, based on the active materials, we divide the devices into four categories: inorganic, organic, hybrid, and perovskite, and their corresponding improvement methods are summarized respectively. To close, we conduct a physical generalization and propose detailed suggestions for the further development of the field. Device Working PrincipleThe structures of lateral PDs are quite simple: an active layer between two parallel electrodes or using three electrodes (source, drain, and gate) for better control; and the detection of light mainly originates from the change of conductivity, which is caused by the increase of the carrier concentration under illumination.Due to their low cost and ease of integration, solution-processed lateral photodetectors (PDs) are becoming an important device type among the PD family. In recent years, enormous effort has been devoted to improving their performances, and great achievements have been made. A summary of the core progress, especially from the perspective of design principles and device physics, is necessary to further the development of the field, but is currently lacking. Here, to address this need, first, the working mechanism of PDs and the device figures-of-merit are introduced. Second, by classifying the active materials into four categories, including in...

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“…Colloidal quantum dots (QDs) made from lead chalcogenides, such as PbSe and PbS, have been extensively used in photodetectors, field effect transistors, light emitting devices (LEDs), and photovoltaic cells . The remarkable versatility of these QDs derives from their bandgap tunability through size control, facile modification of physical properties via surface engineering, and ability to achieve efficient multiple exciton generation .…”

Section: Introductionmentioning

confidence: 99%

PbSe Quantum Dot Passivated Via Mixed Halide Perovskite Nanocrystals for Solar Cells With Over 9% Efficiency

Patterson

Shivarudraiah

et al. 2018

Solar RRL

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PbSe quantum dots (QDs) have stronger electronic coupling resulting from a large Bohr exciton radius, suggesting PbSe QDs may be able to achieve superior charge separation and transport in optoelectronic devices compared with PbS QDs. However, PbS QDs solar cell have achieved a certified 12.01% power conversion efficiency (PCE), whereas PbSe QD photovoltaics lag behind at 8.2% PCE. One reason for this difference is that there has been significantly less work done on surface passivation of PbSe QDs. Here, the surface passivation of chlorinated PbSe QDs is optimized via a halide ion exchange treatment using mixed halide CsPb(Br/I)3 perovskite nanocrystals. Champion devices made from treated QDs achieved a PCE of 9.2%, Voc of 0.56 V, Jsc of 25.7 mA cm−2, and fill factor of 64%. Average PCEs for optimized cells are 8.9%. Detailed physical characterizations including capacitance‐voltage (C‐V), Voc, and Jsc as a function of light intensity, transient photovoltage, and photocurrent measurements are all carried out to investigate the mechanism of the improvement in the PCE and to understand the role of the mixed halide perovskites in providing superior surface passivation for PbSe solar cells. At this time, 9.2% is the highest PCE yet reported for PbSe QDs solar cells.

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Hybrid Organic/PbS Quantum Dot Bilayer Photodetector with Low Dark Current and High Detectivity

Cited by 159 publications

References 53 publications

Recent Progress on Photomultiplication Type Organic Photodetectors

Recent Progress on Photomultiplication Type Organic Photodetectors

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

PbSe Quantum Dot Passivated Via Mixed Halide Perovskite Nanocrystals for Solar Cells With Over 9% Efficiency

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