Self‐Powered Red/UV Narrowband Photodetector by Unbalanced Charge Carrier Transport Strategy

Hou, Yuchen; Wu, Congcong; Huang, Xu; Yang, Dong; Ye, Tao; Yoon, Jungwon; Sriramdas, Rammohan; Wang, Kai; Priya, Shashank

doi:10.1002/adfm.202007016

Cited by 49 publications

(84 citation statements)

References 77 publications

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“…Up to now, not only devices based on perovskite single crystals (PSCs) have been widely used but also perovskite films (PFs)-based devices have shown great potential for high-performance photodetectors for visible light, near-infrared light and high energy ray (Shao et al, 2014;Kim et al, 2017;Wang et al, 2018Wang et al, , 2020. For example, Kim et al (2017) used MAPbI 3 films for large-area, low-dose X-ray imaging, Ji et al (2018) reported OHIPs films-based photodetectors with highperformance and Hou et al (2020) reported narrowband photodetectors based on mixed halide PFs. The critical factors of PFs-based devices are high crystallinity, smooth morphology of films and good lattice matching between layers to form high-quality epitaxial films on substrates, which result in low trap density, long carrier lifetimes, and long diffusion lengths (Shi et al, 2015;Ji et al, 2018;Tang et al, 2019;Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Wang

Zhao

et al. 2021

Front. Mater.

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Recent years, organic-inorganic hybrid perovskites (OIHPs) have been widely used in applications, such as solar cells, lasers, light-emission diodes, and photodetectors due to their outstanding optoelectronic properties. Nowadays photodetectors based on perovskite films (PFs) suffer from surface and interface traps, which result from low crystalline quality of perovskite films and lattice mismatch between perovskite films and substrates. Herein, we fabricate MAPbI3 -(MA = CH3NH3) single-crystal films (SCFs) on MAPbBr3 single crystal substrates in MAPbI3 precursor solution during crystallization process via solution-processed epitaxy. Benefit from the good lattice matching, epitaxial MAPbI3 SCFs with high crystallinity and smooth morphology are of comparable quality to MAPbI3 PSCs and are of better quality than MAPbI3 polycrystalline films. Here we report that epitaxial MAPbI3 SCFs have a low trap density of 5.64×1011 cm–3 and a long carrier lifetime of 11.86 μs. In this work, photodetector based on epitaxial MAPbI3 single-crystal film (SCF) exhibits an excellent stability of a long-term stable response after 120 days, a fast response time of 2.21 μs, a high responsivity of 1.2 A W–1 and a high detectivity of 3.07 ×1012 jones.

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Section: Introductionmentioning

confidence: 99%

Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Wang

Zhao

et al. 2021

Front. Mater.

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“…In the frequency range lower than 20 Hz, the i n of optimal narrowband PMOPDs is mainly dominated by flicker noise (1/f noise). In the frequency range higher than 20 Hz, i n approaches to shot noise limit (i s ), defined as i e I B = 2 s d , [45,46] as shown in the dash line in the inset of Figure 5b. The i n of the optimized narrowband PMOPDs is ≈4.3 × 10 −13 A Hz −1/2 at a frequency of 20 Hz.…”

Section: Resultsmentioning

confidence: 98%

Highly Sensitive Narrowband Photomultiplication‐Type Organic Photodetectors Prepared by Transfer‐Printed Technology

Zhao

Liu

Yang

et al. 2021

Adv Funct Materials

120

113

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Narrowband photomultiplication-type organic photodetectors (PMOPDs) are realized with poly(3-hexylthiophene-2,5-diyl) (P3HT) as the optical field adjusting (OFA) layer and transfer-printed P3HT: [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) (50:1, w/w) as the photomultiplication (PM) layer. The thickness of the OFA layers is adjusted to optimize interfacial trapped electron distribution and density, which determines the external quantum efficiency (EQE) and spectral response range of PMOPDs. Narrowband PMOPDs with 2.5 µm thick P3HT as the OFA layer exhibit two narrow response peaks at 350 and 660 nm, and the corresponding EQE values at 350 and 660 nm are 180% and 760% under an applied bias of −20 V. A wide bandgap polymer poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine] (P-TPD) is deliberately incorporated into OFA layer for adjusting interfacial trapped electron distribution near Al electrode. Narrowband PMOPDs exhibit only one response peak at 660 nm with the enhanced EQE value of 1120% under the same bias. The enhanced EQE of PMOPDs with P-TPD is primarily attributed to the increased hole tunneling injection and transport, which can be ascribed to the enhanced trapped electron density near the Al electrode and the improved hole mobility, respectively. Clearly resolved images can be obtained from the imaging system with the narrowband PMOPDs as sensing pixel without any current preamplifier, indicating the promising potential of PMOPDs in imaging sense.

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“…This appearance of hysteresis loop and analog current change will be beneficial and an essential to mimic the bio-brain-like synaptic functionality. [5,6,[27][28][29] Based on the KPFM measurements, the tentative band alignment in metallic VO 2 phase is schematically illustrated in Figure S4, Supporting Information. To get insight into the Mott transition, the temperature-dependent resistance change (R-T) from 290 to 350 K with F = 5 µn (e.g., initial metallic state) with a tip (d = 120 µm) is measured (Figure 3f).…”

Section: Resultsmentioning

confidence: 99%

An Artificial Mechano‐Nociceptor with Mott Transition

2021

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receptors, known as nociceptors, behave normally; however, they respond rapidly and strongly to harmful stimuli to avoid potential damage. [1,4] In fact, unlike any other sensory receptor, the nociceptor can recognize external harmful inputs and communicate with the central nervous system to take the necessary design. Additionally, the nociceptor sustains its sensitivity with no adaptation below a certain input signal threshold; however, above it, the sensitivity of the nociceptor intensifies (known as hyperalgesia) whereas the threshold is reduced (called allodynia). [1][2][3][4] In efforts to realize these features artificially, recently, the functioning of the bionociceptor has been emulated by using oxide-based memristors and their ability to sense harmful heat (temperature) [5,6] and optical inputs [7] have been demonstrated. Alternatively, mechanical stimuli, which are abundant in the environment, can cause potential damage. Nevertheless, until now, available intelligence touch sensors did not have the inherited ability to recognize objects through touch alone. Therefore, a device that can encode harmful mechanical touch by emulating the biological counterparts of a nociceptor is highly desired; however, yet to be developed.In the meantime, tactile sensing has shown great importance in understanding and collecting precise information about physical properties such as texture, dimensions, stiffness, and weight; in fact, beyond the standard vision and/or auditory signals. [8][9][10][11] Consequently, the development of tactile sensors has recently received tremendous attention. In general, the physical characteristics of the device change with applied force, which is reflected in their response for instance, resistance in piezoresistive, charge storage in capacitive, and voltage in piezo/triboelectric. [10][11][12][13] Beyond the traditionally available passive tactile sensors, highly adaptive neuromorphic sensing, processing, and learning have recently been emulated at device/circuit levels, which provides an economical and feasible solution for next-generation intelligent human-machine interfaces. [12][13][14][15] Despite remarkable progress, however, none of the reported tactile device/circuits can distinguish the touch related to sharp (like a needle, knife, and other) or big objects, even though sharp objects can cause damage to the device and, in turn, lead to failure. Therefore, it is essential and desired to develop an electronic device that can generate accurate, detectable, and intelligent signals with realtime harmful touch; however, true implementation of this feature remains an intriguing open research field. Intelligent touch sensing is now becoming an essential part of various human-machine interactions and communication, including in touchpads, autonomous vehicles, and smart robotics. Usually, sensing of physical objects is enabled by applied force/pressure sensors; however, reported conventional tactile devices are not able to differentiate sharp and blunt objects, although sharp objects can ...

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Self‐Powered Red/UV Narrowband Photodetector by Unbalanced Charge Carrier Transport Strategy

Cited by 49 publications

References 77 publications

Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Highly Sensitive Narrowband Photomultiplication‐Type Organic Photodetectors Prepared by Transfer‐Printed Technology

An Artificial Mechano‐Nociceptor with Mott Transition

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