Dual-ultraviolet wavelength photodetector based on facile method fabrication of ZnO/ZnMgO core/shell nanorod arrays

Self-Powered Wavelength-Dependent Dual-Polarity Response Photodetector Based on CdS@PEDOT:PSS@Au Sandwich-Structured Core–Shell Nanorod Arrays

“…Photodetectors (PDs), which convert optical signals into electric signals, have been applied in spectroscopy, imaging, optical communication, environmental monitoring, and other fields. − Compared with ordinary PDs requiring an external power source, self-powered PDs working independently, sustainably, and wirelessly can meet the demands of a small size, reduced weight, and low-energy consumption for more special applications such as energy-deficient sites and implanted biomedical devices. − The driving force for the self-powered PDs to effectively separate photogenerated carriers is generally the built-in electric field of n–n, p–p, p–n, or Schottky junctions, which belongs to the photovoltaic (PV) effect. − The design of the energy band structure and the quality of junctions seriously affect the property of the self-powered PDs. In addition, the fabrication of low-dimensional nanostructures, such as nanowire (NW) and nanorod (NR), is also an effective approach to improve performance. − In one-dimensional (1D) nanoarray materials, the multiple reflection/scattering of light and the large surface-to-volume ratio can significantly increase the photon absorption and the charge carrier collection, while the high mobility electron pathway can reduce the transit time resulting in enhanced electrical conductivity. − Furthermore, when constructing heterojunctions, core–shell nanorod structures with close contact between active materials possess a large area of the space charge region, enhancing the carrier separation and decreasing the nonradiative recombination rate. − Hence, 1D core–shell nanostructure heterojunctions show great potential for self-powered high-performance PDs.…”

Design strategies of ZnO heterojunction arrays towards effective photovoltaic applications

“…At present, the preparation methods of ZnO NRs arrays mainly include chemical vapor deposition (CVD), [14][15][16][17][18][19][20][21][22] microwave method, 23,24 hydrothermal method, [25][26][27][28][29][30][31][32][33][34][35] lowtemperature oxidation method, 36 electrodeposition method, [37][38][39][40][41][42][43][44] and other methods. [45][46][47][48][49][50][51][52][53][54][55][56] However, ZnO as a semiconductor oxide with wide band gap(~3.2 eV), which limits its utilization of light. Therefore, by introducing the heterojunction array structure, the carrier separation channel is increased by the interface area of the heterojunction, thereby improving the carrier separation and collection efficiency.…”

“…Compared with ZnO nanoparticles (NPs), ZnO NRs arrays have obvious advantages in the process of photo‐generated carriers transport. At present, the preparation methods of ZnO NRs arrays mainly include chemical vapor deposition (CVD), 14–22 microwave method, 23,24 hydrothermal method, 25–35 low‐temperature oxidation method, 36 electrodeposition method, 37–44 and other methods 45–56 . However, ZnO as a semiconductor oxide with wide band gap(~ 3.2 eV), which limits its utilization of light.…”

Low Dark Current and Performance Enhanced Perovskite Photodetector by Graphene Oxide as an Interfacial Layer

“…A variety of promising materials, such as wide band gap semiconductor metal oxides [18,19], methylammonium lead halide perovskites [20], and transition metal dichalcogenides [9,21] have been used for lateral PDs. The metal oxide-based photodetector suffers from persistent photoconductivity due to their native defects which slow the photoresponse [22]. Conversely, the organic materials, including small molecules and polymers, exhibit great potential owing to their virtues of low-cost, simple, and flexible fabrication [17,23].…”