Highly Sensitive Ultraviolet Photodetectors Fabricated from ZnO Quantum Dots/Carbon Nanodots Hybrid Films

Guo, Dengyang; Shan, Chongxin; Qu, Songnan; Shen, Dezhen

doi:10.1038/srep07469

Cited by 130 publications

(60 citation statements)

References 50 publications

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“…The electrons in the conduction band of perovskite then moved downward into the conduction band of the CDs, because the CDs have higher electron affinity (a lower conduction band) than perovskite. Meanwhile, the holes remained in the valance band of perovskite because perovskite has a lower ionization potential (a higher valance band) than the CDs [24,37,46]. This type-II band alignment efficiently enhanced the charge separation at the CsPbBr3/CD interface, enhancing both the photocurrent and responsivity of the photodetector.…”

Section: Working Principle Of the Cspbbr 3 /Cd Composite Photodetectormentioning

confidence: 99%

“…Xie et al [36] reported a core shell heterojunction photovoltaic device composed of a silicon nanowire array and carbon quantum dots, which reached a power conversion efficiency of 9.10% under AM1.5G irradiation. Guo et al [37], fabricated a photodetector based on zinc oxide quantum dots and CDs, which achieved a detectivity and noise equivalent power of 3.1 × 10 17 cmHz 1/2 /W and 7.8 × 10 −20 W, respectively. Moreover, in photosensing applications, it has been demonstrated that the photoresponsivity of p-n junction based photodetectors can be increased by the use of graphene nanosheets composites [38,39].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)

et al. 2019

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A hybrid composite photodetector based on cesium lead bromine perovskite (CsPbBr3) nanosheets and carbon nanodots (CDs) was fabricated on a quartz substrate by a one-step method of spin-coating and hot-plate annealing. The responsivity of the CsPbBr3/CD hybrid composite photodetector was 608 mAW−1 (under a 520-nm laser diode source applied at 0.2 mWcm−2), almost three times higher than that of a CsPbBr3-based photodetector (221 mAW−1). The enhanced performance of the CsPbBr3/CD photodetector is attributable to the high band alignment of the CDs and CsPbBr3, which significantly improves the charge extraction at the CsPbBr3/CD interface. Moreover, the hybrid CsPbBr3/CD photodetector exhibited a fast response time with a rise and decay time of 1.55 and 1.77 ms, which was faster than that of a pure CsPbBr3 based photodetector, indicating that the CDs accelerate the extraction of electrons and holes trapped in the CsPbBr3 film.

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Section: Working Principle Of the Cspbbr 3 /Cd Composite Photodetectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)

et al. 2019

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“…[26][27][28][29] The key problem is that some of 7 60 °C under vacuum. In this study, we have successfully fabricated a single precursor using metal-organic framework (MOF) (zeolitic imidazolate framework, ZIF-8) and carbon nanotubes (CNTs).…”

mentioning

confidence: 99%

“…[26][27][28][29] The key problem is that some of 7 60 °C under vacuum. [26][27][28][29] The key problem is that some of 7 60 °C under vacuum.…”

mentioning

confidence: 99%

All-solid-state asymmetric supercapacitors based on ZnO quantum dots/carbon/CNT and porous N-doped carbon/CNT electrodes derived from a single ZIF-8/CNT template

et al. 2016

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Currently, the development of two kinds of materials from a single precursor has been an important frontier in material synthesis. In this study, we have successfully fabricated a single precursor using metal-organic framework (MOF) (zeolitic imidazolate framework, ZIF-8) and carbon nanotubes (CNTs). ZnO quantum dots (QDs)/carbon/CNTs and porous N-doped carbon/CNTs have been selectively synthesized from the single ZIF-8/CNTs template. When the two derived materials were used for supercapacitor electrode, they showed high capacitance values (185 F g -1 g for ZnO QDs/carbon/CNTs at 0.5 A g -1 and 250 F g -1 g for porous N-doped carbon/CNTs at 1 A g -1 , respectively). Further, an all-solid-state asymmetric supercapacitor (ASC) device using ZnO QDs/carbon/CNTs as the positive electrode and porous N-doped carbon/CNTs as the negative electrode was fabricated, and this device could reach a working potential of 1.7 V, delivering a maximum energy density of 23.6 W h kg -1 and a maximum power density of 16.9 kW kg -1 , which is better than those of the ZnO-based symmetric or asymmetric supercapacitor devices. fact that they have high theoretical capacitance values, low cost, environmental friendliness, high electrochemical stability, etc. 2 However, the low charge storage capability and narrow working potential window limit their further applications in SCs. In an effort to address this challenge, various carbon materials, such as graphene, 3-9 reduced graphene oxides, 10-13 carbon nanotubes (CNTs), 2, 14-18 graphitic carbon nanofibers, 19, 20 carbon arrays 21 and activated carbon, 22 have been widely used to modify ZnO electrode materials due to their contribution on additional electric double layer capacitance and enlarged working potential window. However, the weak adhesive force between carbon materials and ZnO nanocrystals usually leads to pulverization of the electrodes, resulting in poor cycle stability. 23 Besides, the maximum reported potential window for ZnO/carbon materials electrodes is 1 V, which obviously results in limited energy density. Rational design and facile synthesis of ZnO-based supercapacitors for excellent cycling performance and outstanding energy density still remain a challenge. Among multifarious strategies, fabricating uniformly dispersed small ZnO particles in carbon matrix and developing asymmetric supercapacitors (ASCs) to maintain the mechanical integrity of the composite material and enlarge the working potential window can be effective approaches to solve the main problems. 24, 25 As well as we know, small enough particles embedded into carbon matrix can produce strong adhesion, and quantum dot (QD) can be a suitable candidate among various small scale particles.To date, numerous methods have been reported for the synthesis of ZnO quantum dots composited with carbon materials. [26][27][28][29] The key problem is that some of 7 60 °C under vacuum. For comparison, the ZIF-8 and ZIF-8/CNTs within different amounts of CNTs were also prepared and characterized. The ZIF-8/CNTs composites are...

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“…the metal/semiconductor interfaces [10][11][12]23,24]. Due to the ZnO films with surface states and grain boundaries, the interface states will be formed at the interfaces of Au/ZnO during the electrodes fabrication.…”

Section: Resultsmentioning

confidence: 99%

Fast response ultraviolet photodetectors based on solution-processed ZnO nanocrystals

Zhang

Deng

et al. 2015

Sci. China Technol. Sci.

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By utilizing Schottky contact in device fabrication, we have constructed fast response ultraviolet photodetectors based on the solution-processed ZnO nanocrystals. At 5 V, the detector exhibits fast photoresponse with a rise time of 20 ns and fall time of 350 ns, which is one of the fastest response time among the reported ZnO-based photodetectors. The results reported in this paper may show great promise for fast response optoelectronic devices based on the solution-processed nanocrystals. ultraviolet photodetector, solution-processed nanocrystal, ZnO, fast response Citation: Zhang T S, Yu J, Deng Y F, et al. Fast response ultraviolet photodetectors based on solution-processed ZnO nanocrystals.

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Highly Sensitive Ultraviolet Photodetectors Fabricated from ZnO Quantum Dots/Carbon Nanodots Hybrid Films

Cited by 130 publications

References 50 publications

Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)

Enhanced Photoresponsivity of All-Inorganic (CsPbBr3) Perovskite Nanosheets Photodetector with Carbon Nanodots (CDs)

All-solid-state asymmetric supercapacitors based on ZnO quantum dots/carbon/CNT and porous N-doped carbon/CNT electrodes derived from a single ZIF-8/CNT template

Fast response ultraviolet photodetectors based on solution-processed ZnO nanocrystals

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