A Self‐Powered and Flexible Organometallic Halide Perovskite Photodetector with Very High Detectivity

Leung, Siu Fai; Ho, Kang-Ting; Kung, Po-Kai; Hsiao, Vincent K. S.; Alshareef, Husam N.; Wang, Zhong Lin; He, Jr‐Hau

doi:10.1002/adma.201704611

Cited by 362 publications

(242 citation statements)

References 41 publications

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“…[22] Compared to the homogeneously doped BiVO 4 , the continuous built-in band bending induces the directional transfer of photogenerated holes from core to surface and thus increases the carrier separation efficiency to 60%. Apart from the integrated system with an energy conversion or harvester unit, [5][6][7] the perovskite photodiode is an excellent alternative in terms of simple structure, light weight, and portability. [23] We reported graded CdS x Se 1-x nanobelt solar cells by utilizing continuous stepped energy levels to drive electrons and holes toward opposite direction.…”

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confidence: 99%

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

et al. 2019

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possess lower dark currents and higher detectivities. In spite of great progresses, it is complicated to fabricate composite electronic transport layers (ETLs) with matched crystal lattices and energy levels, otherwise the newly formed interface in the composite may bring about large amounts of defects which act as trap sites and recombination centers.Spatially graded composition (bandgap) is an effective route to continuously tune energy levels and bandgap in semiconductors, [20,21] in which the interfacial recombination is alleviated or removed and a graded built-in potential through the whole bulk is produced, enabling stronger separation capability of photogenerated electron-hole pairs. This concept provides a new platform for designing high-performance optoelectronic devices. For example, Krol and co-workers fabricated the gradient W-doped BiVO 4 as a photoanode of photoelectrochemical cell. [22] Compared to the homogeneously doped BiVO 4 , the continuous built-in band bending induces the directional transfer of photogenerated holes from core to surface and thus increases the carrier separation efficiency to 60%. Tailoring the gradient bandgap from 0.35 to 1.42 eV, Pan and co-workers synthesized InAs x P 1-x nanosheets for band-selective infrared photodetectors. [23] We reported graded CdS x Se 1-x nanobelt solar cells by utilizing continuous stepped energy levels to drive electrons and holes toward opposite direction. [24] In p-i-n structured devices, [25][26][27][28] graded composition (bandgap) is basically used in the main photosensitive layer, for which the narrow bandgap region increases the absorption wavelength range, the large bandgap results in a high voltage output, and graded bandgap structure promotes the carriers transport. Inspired by previous results, with the introduction of gradient built-in band bending at the charge extraction layer/perovskite interface, the energy band offset is expected to provide the driving force for enhanced carrier separation, suppressed electron reflux, and reduced recombination, boosting the performance of perovskite photodetectors.In this work, we present a high-performance self-powered photodetector by integrating perovskite with gradient O-doped CdS nanorod array. For the first time, the continuous builtin band bending is introduced at the charge extraction layer/ perovskite interface to manipulate the transfer behavior of carriers in perovskite photodetectors. The optoelectronic measurements reveal that both the responsivity and the response speed of devices strongly depend on the structure of energy band bending. The optimum gradient O-doped CdS/perovskite Self-powered photodetectors are highly desired to meet the great demand in applications of sensing, communication, and imaging. Manipulating the carrier separation and recombination is critical to achieve high performance. In this paper, a self-powered photodetector based on the integrated gradient O-doped CdS nanorod array and perovskite is presented. Through optimizing the degree of continuous built-in ba...

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Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

et al. 2019

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“…Organic–inorganic lead halide perovskites have recently been intensively investigated due to their superior optoelectronic and photovoltaic characteristics. Since their pioneering application in solar cells with an efficiency of 3.8% in 2009, researchers have made great efforts to further develop metal halide perovskites in various applications such as field‐effect transistors, solar cells, photodetectors, thermoelectrics, tandem devices, light‐emitting electrochemical cells, diodes, and laser . Despite the rapid growth of the organic–inorganic lead halide perovskite research efforts in both academia and industry, two biggest challenges still remain and hinder their widespread applications.…”

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confidence: 99%

Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability

Han

Liang

Yang

et al. 2019

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Long‐term instability and possible lead contamination are the two main issues limiting the widespread application of organic–inorganic lead halide perovskites. Here a facile and efficient solution‐phase method is demonstrated to synthesize lead‐free Cs2SnX6 (X = Br, I) with a well‐defined crystal structure, long‐term stability, and high yield. Based on the systematic experimental data and first‐principle simulation results, Cs2SnX6 displays excellent stability against moisture, light, and high temperature, which can be ascribed to the unique vacancy‐ordered defect‐variant structure, stable chemical compositions with Sn4+, as well as the lower formation enthalpy for Cs2SnX6. Additionally, photodetectors based on Cs2SnI6 are also fabricated, which show excellent performance and stability. This study provides very useful insights into the development of lead‐free double perovskites with high stability.

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“…As shown in Figure c, the data can be transferred directly to a smart mobile device using an antenna and a batteryless NFC chip with a small built‐in CPU capable of data processing. Leung et al reported a photodetector integrated with triboelectric nanogenerators (TENGs), which are batteryless, flexible, and transparent . The device exploits halide‐structured methylammonium lead iodide (CH 3 NH 3 PBI 3 ) perovskite, which enabled high detectivity, flexibility, and transparency, thus enabling compatibility to a wearable platform.…”

Section: Advanced Applications Of Smart Sensing Systems Based On Optomentioning

confidence: 99%

“…e) Characteristics of the perovskite photodetector which present the photocurrent and responsivity under a variety of intensities of light. d,e) Reproduced with permission . Copyright 2018, Wiley‐VCH.…”

Section: Advanced Applications Of Smart Sensing Systems Based On Optomentioning

confidence: 99%

Smart Sensing Systems Using Wearable Optoelectronics

Hwang

et al. 2020

Advanced Intelligent Systems

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A wearable smart sensing system is capable of continuously monitoring biometric information such as respiration, pulse, and body temperature while attached to an arbitrary surface on the user's body to be utilized freely during activities. Research conducted on new materials, fabrication processes, structure of electrodes, and wireless communication technologies has made constant progress in the development of smart sensing systems that use entirely wearable forms of devices to go beyond conventional devices that are based on intrinsically rigid components, such as silicon. Among various platforms that can be used in the development of smart sensing systems, optoelectronics provides innovative sensing functions (e.g., human–machine interfaces and phototherapy) that can be transferred from traditional healthcare to smart healthcare, such as point of care. Optoelectronics are light‐mediated displays that allow a light source to be controlled and a large light spectrum to be detected. Recently, this platform that uses smart and wearable optoelectronic sensing systems has become increasingly advanced to better help human beings treat their diseases through self‐healthcare. Herein, recent advanced technologies in materials, structures, and wireless platforms for smart sensors using wearable optoelectronics are reviewed.

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A Self‐Powered and Flexible Organometallic Halide Perovskite Photodetector with Very High Detectivity

Cited by 362 publications

References 41 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability

Smart Sensing Systems Using Wearable Optoelectronics

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A Self‐Powered and Flexible Organometallic Halide Perovskite Photodetector with Very High Detectivity

Cited by 362 publications

References 41 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Lead‐Free Double Perovskite Cs2SnX6: Facile Solution Synthesis and Excellent Stability

Smart Sensing Systems Using Wearable Optoelectronics

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Lead‐Free Double Perovskite Cs₂SnX₆: Facile Solution Synthesis and Excellent Stability