Toward facile broadband high photoresponse of fullerene based phototransistor from the ultraviolet to the near-infrared region

Du, Liqing; Luo, Xiao; Zhao, Feiyu; Lv, Wenli; Zhang, Jianping; Peng, Yingquan; Tang, Ying; Wang, Ying

doi:10.1016/j.carbon.2015.10.005

Cited by 57 publications

(44 citation statements)

References 42 publications

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“…45 Further, the intensity dependent photocurrent and photoresponsivity can be fitted by the power laws I ph ∝P inc γ and R ∝ P inc α−1 , 10, 44 and the γ and α are estimated to be 0.80 and 0.79, which are obviously superior to those values based on previous published semiconductors. 10,18 It has been confirmed that the non-unity exponentials are the result of the recombination kinetics of photocarriers relating to trap states and coupling effect. 6,46 Thus, the higher exponentials mean lower charge recombination or trapping ratios, beneficial to achieve highperformance photodetectors.…”

Section: Discussionmentioning

confidence: 90%

“…Whereas, the R versus P inc relationship displays a superlinear decrease behavior, which is also commonly observed in some organic and inorganic photodetectors. 10,17,44 This effect can be associated with a reduction of the number of photogenerated carriers available for extraction under high light intensity. 45 Further, the intensity dependent photocurrent and photoresponsivity can be fitted by the power laws I ph ∝P inc γ and R ∝ P inc α−1 , 10, 44 and the γ and α are estimated to be 0.80 and 0.79, which are obviously superior to those values based on previous published semiconductors.…”

Section: Discussionmentioning

confidence: 99%

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Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Luo

Zhao

et al. 2017

npj Flex Electron

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Organolead halide perovskite is a newly emerging low-cost, solution-processable material with a broadband absorption from the ultraviolet (UV) to visible (Vis) region, which has attracted a great deal of interest in high-performance optoelectronic devices. However, some practicable applications need a cover of UV-Vis-NIR region for photoelectric conversion, a task that remains a significant challenge for further extending the absorption toward the near-infrared radiation (NIR) region. Here, to the best of our knowledge, we prove for the first time an ultrasensitive flexible broadband photodetector based on porous organolead perovskitephthalocyanine heterostructure, which combines the synergetic properties of high UV-Vis absorbance of perovskite with enhanced NIR absorption for triclinic lead phthalocyanine. The photosensitivity of the as-prepared devices reaches up to 10 4 at a low intensity of 10 mW cm −2 , which is among the largest values reported for broadband photodetectors. Significantly, performed at room temperature, the device achieves a pA scale dark current along with an ultrafast response speed of less than 0.6 ms for as-adopted full spectra. Our results provide an easy and promising route to develop low-cost, flexible and highly sensitive UV-Vis-NIR photodetectors.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Luo

Zhao

et al. 2017

npj Flex Electron

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“…As the hole mobility is more than five times higher than electron mobility in CH 3 NH 3 PbI x Cl 3‐ x films, therefore to the contrary of photoinduced holes flowing into the electrode immediately, some of the photoinduced free electrons will be residual inside film and then accumulate near the cathode (Au). Now look back to Figure, the accumulation of electrons near the cathode would reduce the hole potential energy and result in the highest occupied molecular orbital (HOMO) of perovskite bend upward, which decreases the barrier at the interface between perovskite and Au (the green folding line with arrow) . The photoinduced decrease of hole injection barrier would be a key factor to the multiplied photocurrent.…”

Section: Device Characterizations and Discussionmentioning

confidence: 99%

“…The photodiodes and photodetectors are widely explored for a variety of scientific and industrial applications, like optical communications, environmental monitoring, and day/night‐time surveillance . However, current commercially available inorganic photodiodes have the disadvantages like relatively high cost and narrow optical spectra response that heavily limit their broadband practical applications.…”

Section: Introductionmentioning

confidence: 99%

Toward High Uniformity of Photoresponse Broadband Hybrid Organic–Inorganic Photodiode Based on PVP‐Modified Perovskite

Zhao

Luo

et al. 2017

Advanced Optical Materials

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Broadband photodiode based on Si/perovskite structure that combines the advantages of both silicon and perovskite is presented in this paper. This study addresses the issue of the absent of ultraviolet absorption of silicon and the near‐infrared absorption of perovskite. More significantly, the polyvinyl pyrrolidone (PVP) modification process on the perovskite film shows efficiency on morphology and crystallizing control that are important for high uniformity of responsivity and reproducibility. The result shows high spectral uniformity of responsivity (uSR = 0.85) on a wide spectrum ranging from 405 to 808 nm and the average of deviation of reproducibility is only 2.1%. Fast response time (645 µs), good on–off switching performance, and high photosensitivity (Ion/Ioff = 1322) of the as‐fabricated device are also achieved in this work. This research indicates that the high‐performance broadband photodiode can be realized by the novel organic–inorganic structure and PVP modification without compromising any of its performance.

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“…Organic π‐conjugated small molecule‐ and polymer‐based optoelectronic devices are of extraordinary significance for their merits over their inorganic counterparts, including excellent mechanical flexibility, cost‐effective fabrication, and tunable optoelectronic properties by rational molecular structure design, and broad material choices . More importantly, organic semiconductors can efficiently absorb light in the optical spectrum from UV to NIR either panchromaticly or selectively and show good photogeneration yield, which enables their successful development in the field of light detection . Panchromatic sensitive materials have aroused considerable attention for light detectors in various fields such as environmental monitoring, optical communication, or laboratory instrumentation for optical spectroscopy .…”

Section: Introductionmentioning

confidence: 99%

Charge Transport Behavior and Ultrasensitive Photoresponse Performance of Exfoliated F₁₆CuPc Nanoflakes

Hao

Qin

et al. 2019

Advanced Optical Materials

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Air‐stable, photosensitive copper hexadecafluorophthalocyanine (F16CuPc) is a promising n‐type semiconductor for organic electronics and optoelectronics. However, the performance of F16CuPc‐based devices is significantly limited by the poor crystallinity of thin films. Here, the charge transport and electrical contact behavior of F16CuPc nanoflakes, mechanically exfoliated from needle‐like bulk single crystals, are probed by analyzing the temperature‐dependent carrier mobility and conductance, where the multiple‐trap/release‐ and band‐like transport mechanism govern the charge transport at different temperature ranges and carrier densities. F16CuPc nanoflake‐based field effect transistors (FETs) exhibit high on‐state current and ON/OFF ratio, one‐order magnitude higher than those of reported F16CuPc nanowires, thin films, and nanoribbons. Besides, F16CuPc nanoflake‐based phototransistors exhibit attractive photoresponse performance in the spectral range of 300–750 nm even at quite low operating source–drain voltage (1 V), with maximum photoresponsivity of 19 A W−1, detectivity of 8 × 1012 Jones, and fast response speed of 36 ms, which is attributed to the single‐crystalline characteristic of nanoflakes, and the resultant efficiently exciton diffusion and charge transport. The work demonstrates that 2D organic nanoflakes with single‐crystalline feature will be promising candidates for flexible electronic and optoelectronic devices.

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Toward facile broadband high photoresponse of fullerene based phototransistor from the ultraviolet to the near-infrared region

Cited by 57 publications

References 42 publications

Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Toward High Uniformity of Photoresponse Broadband Hybrid Organic–Inorganic Photodiode Based on PVP‐Modified Perovskite

Charge Transport Behavior and Ultrasensitive Photoresponse Performance of Exfoliated F₁₆CuPc Nanoflakes

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Toward facile broadband high photoresponse of fullerene based phototransistor from the ultraviolet to the near-infrared region

Cited by 57 publications

References 42 publications

Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Ultrasensitive flexible broadband photodetectors achieving pA scale dark current

Toward High Uniformity of Photoresponse Broadband Hybrid Organic–Inorganic Photodiode Based on PVP‐Modified Perovskite

Charge Transport Behavior and Ultrasensitive Photoresponse Performance of Exfoliated F16CuPc Nanoflakes

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Charge Transport Behavior and Ultrasensitive Photoresponse Performance of Exfoliated F₁₆CuPc Nanoflakes