Increasing organic vertical carrier mobility for the application of high speed bilayered organic photodetector

Tsai, Wu Wei; Chao, Yu Chiang; Chen, En Chen; Zan, Hsiao Wen; Meng, Hsin Fei; Hsu, Chain‐Shu

doi:10.1063/1.3263144

Cited by 42 publications

(29 citation statements)

References 8 publications

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“…[ 184 ] We draw the attention of the reader to the diverse range of proposed strategies to increase the speed of resp onse. [ 103,183,[185][186][187] …”

Section: Reviewmentioning

confidence: 98%

Organic Photodiodes: The Future of Full Color Detection and Image Sensing

et al. 2016

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Major growth in the image sensor market is largely as a result of the expansion of digital imaging into cameras, whether stand-alone or integrated within smart cellular phones or automotive vehicles. Applications in biomedicine, education, environmental monitoring, optical communications, pharmaceutics and machine vision are also driving the development of imaging technologies. Organic photodiodes (OPDs) are now being investigated for existing imaging technologies, as their properties make them interesting candidates for these applications. OPDs offer cheaper processing methods, devices that are light, flexible and compatible with large (or small) areas, and the ability to tune the photophysical and optoelectronic properties - both at a material and device level. Although the concept of OPDs has been around for some time, it is only relatively recently that significant progress has been made, with their performance now reaching the point that they are beginning to rival their inorganic counterparts in a number of performance criteria including the linear dynamic range, detectivity, and color selectivity. This review covers the progress made in the OPD field, describing their development as well as the challenges and opportunities.

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“…[ 184 ] We draw the attention of the reader to the diverse range of proposed strategies to increase the speed of resp onse. [ 103,183,[185][186][187] …”

Section: Reviewmentioning

confidence: 98%

Organic Photodiodes: The Future of Full Color Detection and Image Sensing

et al. 2016

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“…Recently, the study of OPDs made of pentacene and C 60 has shown that the utilization of organics with high carrier mobility can increase the bandwidth of the OPDs. 10 As we known, crystalline rubrene holds the distinction of being the organic semiconductor with the highest carrier mobility, which reaches 40 cm 2 V À1 s À1 for holes. 11 The hole mobility of amorphous rubrene can also reach the range of 7-9 Â 10 À3 cm 2 V À1 s À1 at room temperature.…”

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confidence: 95%

Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C60

Yang

Zhou

et al. 2014

Journal of Applied Physics

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We studied the transient response characteristics of organic photodetectors composing of high mobility materials of rubrene and C 60 , respectively, as donor and acceptor. It was found that the response speed was limited by the delay time of both exciton diffusion and transit, and an anomalous phenomenon that the bandwidth decreases as the reverse bias increases was found for the first time. The investigation of frequency dependence at different device structures and light excitations demonstrated that the light absorption of rubrene prevents the photodetector from obtaining a fast response. With the help of magnetic field effect study, it was clearly elucidated that the slow diffusion time of the long lifetime triplet excitons generated from singlet fission in rubrene limited the bandwidth of the device. Moreover, the simulation of the response of photodetector under transient and steady state by exciton transport-diffusion equation showed that the exciton dissociation efficiency in rubrene increases more quickly than that in C 60 , which should account for the negative dependence of bandwidth on the reverse bias in rubrene-based device. V C 2014 AIP Publishing LLC. [http://dx.

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“…The G is ≈626 at the wavelength of 532 nm obtained by EQE spectrum (equivalent to 6.26 × 10 4 % of EQE), τ c in this work is 74 µs, V is 1 V, and d is 360 nm, obtaining a calculated µ of 1.1 × 10 −2 cm 2 V −1 s −1 . Although the µ across the device is much smaller than that of the perovskite materials because of the lower µ of PCBM (≈10 −3 cm 2 V −1 s −1 ), it still has a large improvement compared with organic photodetectors (≈10 −4 to ≈10 −3 cm 2 V −1 s −1 ), which is due to the reduced carrier transport path in organic materials and rapid transmission in perovskite. Figure S5 (Supporting Information) shows the normalized response as a function of pulse frequency.…”

Section: Resultsmentioning

confidence: 99%

Trapped‐Electron‐Induced Hole Injection in Perovskite Photodetector with Controllable Gain

Zhang

Liu

et al. 2018

Advanced Optical Materials

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Perovskite is an excellent photosensitive material but it exhibits a shortcoming in providing photoconductive gain for layered photodetectors due to lacking of trap states. Here, the perovskite photodetectors are fabricated with controllable photoconductive gain by designing a trapped‐electron‐induced hole injection structure of [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM):2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4‐TCNQ)/Bathocuproine/Au. The deep trap states provided by F4‐TCNQ can capture the photogenerated electrons from perovskite, which makes the hole injection barrier thin enough to be tunneled through, allowing the hole injection and forming a gain. Meanwhile, the gain is controllable by adjusting the electron trapping and hole transport capacities of PCBM:F4‐TCNQ dual‐functional layer, concomitantly realizing the transition of device from photovoltaic to photoconductive. Thus fabricated device achieves a higher external quantum efficiency of 6 × 104% at a lower bias of −1 V, and simultaneously maintains the rectifying behavior in dark, providing the detectivity of about 1 × 1015 Jones.

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Increasing organic vertical carrier mobility for the application of high speed bilayered organic photodetector

Cited by 42 publications

References 8 publications

Organic Photodiodes: The Future of Full Color Detection and Image Sensing

Organic Photodiodes: The Future of Full Color Detection and Image Sensing

Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C60

Trapped‐Electron‐Induced Hole Injection in Perovskite Photodetector with Controllable Gain

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