Investigation of Interface Effect on the Performance of CH₃NH₃PbCl₃/ZnO UV Photodetectors

Abstract

Recent investigations indicate that the performance of organic-inorganic perovskite optoelectronic devices can be improved by combining the perovskites and the inorganic materials. However, very few studies have focused on the investigation of perovskites/inorganic semiconductor hybrid UV photodetectors and their detailed performance-enhancement mechanism is still not very clear. In this work, a CHNHPbCl/ZnO UV photodetector has been first demonstrated and investigated. Both the photoresponsivity and response speed of the hybrid device are higher than those of pure CHNHPbCl and ZnO devices. The photoluminescence and transient absorption spectra indicate that the photoinduced electron transfer between CHNHPbCl and ZnO should be responsible for the performance enhancement of the hybrid device. In addition, the high crystal quality of CHNHPbCl on ZnO film is another important reason for the excellent UV detection performance. Our findings in this work provide new insights into the intrinsic photophysics essential for perovskite optoelectronic devices.

Study on photoelectric characteristics of monolayer WS2 films

“…In the TA test, we employed the femtosecond laser. As per the previous reports, [40][41][42] the carrier dynamics probed by the TA technique was the same as that induced by the CW-laser, since the generation of the carrier was independent of the CW-laser or a femtosecond laser. The initial TA spectrum in Fig.…”

Influence of the rate of radiation energy on the charge-carrier kinetics application of all-inorganic CsPbBr3 perovskite nanocrystals

“…1,9 These novel optical and electrical attributes such as the large coefficient of absorption, 10 high carrier mobility, 11 low recombination rate 1,12 together with high photoluminescence quantum yield (PLQY) 1 and superior stability 13 are the wide range attributes of CsPbX 3 (X ¼ Cl, Br, and I) 1,13 in comparison to their hybrid counterparts MAPbX 3 (MA ¼ CH 3 NH 3 , X ¼ Cl, Br, and I). 14 From the above-mentioned features, one can easily comprehend that the kinetics of the photo-generated electron-hole 15,16 pairs inside PNCs plays a decisive role in their optoelectronic properties. 17 The timeresolved photoluminescence (TRPL) [18][19][20][21][22][23][24][25][26][27][28][29] and transient absorption (TA) [30][31][32][33][34][35][36][37] spectroscopies used to study the ultrafast photo-physical operation of charge carrier kinetics 33 in the context of the generation and recombination, 30,34 relaxation of the hot carriers, 30 properties of the interfacial charge transport 30,[38][39][40] and pathways of negligible electron-hole conrmed with the treatment of these spectroscopic techniques, which accounts for a high PLQY 1 in th...…”

UV and Visible Photodetectors of MAPbBr3 and MAPbCl3 Perovskite Single Crystals via Single Photocarrier Transport Design

“…[13,14] Over a wide range of halide-based hybrid perovskite materials, MAPbCl 3 and MAPbBr 3 have better transparency, robust stability, and high sensitivity to visible and ultraviolet (UV) light, and therefore show good potential as materials for photodetectors. [15,16] The visible light photodetection can be used for video imaging, biological sensing, or convert communication. [17] To expand and increase the performance of the photo detectors, a method to improve the photocarrier transport and to understand its correlation with defects is required.The generation and transport of photogenerated charges is directly associated with the sensitivities and response speeds of photodetectors.…”