Flexible and air-stable perovskite network photodetectors based on CH3NH3PbI3/C8BTBT bulk heterojunction

Xia, Huayan; Tong, Shuang; Zhang, Chujun; Wang, Chunhua; Sun, Jia; He, Jun; Zhang, Jian; Gao, Yongli; Yang, Junliang

doi:10.1063/1.5024330

Cited by 89 publications

(65 citation statements)

References 34 publications

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“…The ability of the PDs to detect weak light signals can be represented by specific detectivity (D*). The shot noise limited D* was first derived, which can be calculated from the equation of D * = R /(2 × q × J dark ) 1/2 , in which q is the elementary charge and R is the responsivity . Figure d shows that calculated shot noise limited D * of IPD is much higher than that of the PVPD.…”

Section: Resultsmentioning

confidence: 99%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Chen

et al. 2018

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Ultraviolet-visible-near infrared (UV-Vis-NIR) broadband detection is important for image sensing, communication, and environmental monitoring, yet remains as a challenge in achieving high external quantum efficiency (EQE) in the broad spectrum range. Herein, sensitive broadband integrated photodetectors (PDs) with high EQE levels are reported. The organic bulk-heterojunction (OBHJ) layer, based on a NIR sensitive organic acceptor, is employed to extend the response spectrum of the perovskite PDs. A key strategy of introducing dual electron transport materials respectively for Vis and NIR regions into the active layer of integrated PDs is applied. Further combined with the proper energy level alignment and reasonable distribution of PC BM in the active layer, the extraction and transport of photo induced charges in between perovskite and OBHJ is promoted efficiently. The integrated PD with the optimized structure exhibits an EQE mostly beyond 70% in the Vis-NIR region, which is the highest value among the ever reported solution-processable broadband PDs. The highest responsivity is 0.444 and 0.518 A W in the Vis and NIR region, respectively. The specific detectivity is beyond 10 Jones in the range from 340 to 940 nm, enabling the device to detect weak signals in the UV to NIR broad region.

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Section: Resultsmentioning

confidence: 99%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Chen

et al. 2018

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“…To date, several OSCs have been integrated with perovskites for assembling phototransistors and hybrid photodetectors . The device geometry involved is usually a double‐layer or blend heterojunction of perovskite and OSC.…”

Section: Perovskite/organic Semiconductor Heterojunctionsmentioning

confidence: 99%

Perovskite‐Based Phototransistors and Hybrid Photodetectors

Xie

Liu

Loi

et al. 2019

Adv Funct Materials

268

250

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In the past several years, organic-inorganic hybrid perovskites and all inorganic perovskites have attracted enormous research interest in a variety of optoelectronic applications including solar cells, light-emitting diodes, semiconductor lasers, and photodetectors for their plenty of appealing electrical and optoelectrical properties. Benefiting from the inherent amplification function of transistors and the pronounced photogating effect, perovskite-based phototransistors and hybrid photodetectors can provide very high photoresponsivity and gain, rendering them highly promising for some specific applications especially ultrasensitive light detection. A review on the recent progress of phototransistors and hybrid photodetectors using perovskites as light-sensitive materials is presented. The efforts and development in 3D and 2D perovskite-based phototransistors, and perovskite/functional material (e.g., graphene, 2D semiconductors, organic semiconductors, and other semiconductors) heterojunctionbased hybrid photodetectors are introduced and discussed systematically. Some processing techniques for optimizing device performance are also addressed. In the final section, a conclusion of the research achievements is presented and possible challenges as well as outlook are provided to guide future activity in this research field.

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“…However, the applications based on above photodetectors are seriously restricted due to their either energy‐intensive fabrication process or imperfect material characteristics. Recently, the organic–inorganic hybrid perovskite (OIHP) materials with superior physical properties have emerged and rivaled with above traditional materials due to the large optical absorption coefficient, tunable bandgaps, long exciton diffusion length, and high charge‐carriers mobility . Up to now, the excellent performance of OIHP photodetectors with high‐gain, ultrasensitive, ultrafast response speed, wavelength‐selective, or ultralong linear dynamic range have been reported by some groups, respectively .…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive, Fast Response Perovskite Photodetectors Demonstrated in Weak Light Detection Circuit and Visible Light Communication System

Yan

et al. 2019

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116

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Organic–inorganic hybrid perovskite (OIHP) photodetectors have presented unprecedented device performance mainly owing to outstanding material properties. However, the solution‐processed OIHP polycrystalline thin films with defective surface and grain boundaries always impair the key parameter of photodetectors. Herein, a nonfullerene passivation layer exhibits more efficient passivation for OIHP materials to dramatically reduce the trap density of state, yielding a dark current as low as 2.6 × 10−8 A cm−2 under −0.1 V. In addition, the strong absorption in near‐infrared (NIR) region of nonfullerene/C60 heterojunction broadens the detectable range to over 900 nm by effective charge transport, ultimately leading to a specific detectivity of 1.45 × 1012 and 7.37 × 1011 cm Hz1/2 W−1 at 650 and 820 nm, respectively. Encouragingly, the response speed of 27 ns is obtained at 0.6 mm2 of device area by removing constrain from the resistance–capacitance constant. Moreover, the prominent practical application of the photodetector is demonstrated in a weak light detection circuit and a visible light communication system. It is believed that the OIHP photodetectors with high sensitivity, NIR photoresponse, and ultrafast speed would pave the way to commercial applications.

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Flexible and air-stable perovskite network photodetectors based on CH3NH3PbI3/C8BTBT bulk heterojunction

Cited by 89 publications

References 34 publications

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Perovskite/Organic Bulk‐Heterojunction Integrated Ultrasensitive Broadband Photodetectors with High Near‐Infrared External Quantum Efficiency over 70%

Perovskite‐Based Phototransistors and Hybrid Photodetectors

Highly Sensitive, Fast Response Perovskite Photodetectors Demonstrated in Weak Light Detection Circuit and Visible Light Communication System

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