Hybrid Perovskite Photoconductivity Visible Region Detector with High Speed and Stability

Abstract

Hybird perovskite materials have been regarded as an outstanding candidate in the optoelectronic devices. In this work, a high speed perovskite photodetector (PD) based on the gas-solid reaction process was proposed and a high responsivity and detectivity of 5.87 A W À1 , $ 10 12 Jones were obtained after annealing at 120 C for 30 min. Compared to traditional solution process, the gas-solid reaction provided a full coverage¯lm with high crystallization, which is bene¯cial to the electrons transportation and the capture of the incident light. The response time of device is up to 248 s/207 s under 700 Hz. More importantly, the device exhibits a good stability after storing in the air for two months. The perovskite PD shows a high performance upon the light illumination, revealing that the hybrid perovskite is a promising candidate for optoelectronic applications.

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

“…And the normalized EQE of MAPbBr 3 single crystal in Figure 3E indicates that photodetectors based on epitaxial films can widen the absorption range of substrate. As shown in Figure 3F, a 6 ns pulsed laser is used to measure the response speed and it takes only 2.21 µs for current decay to 63% at 20 V bias, which is much faster than devices based on polycrystalline films, owing to the high quality of epitaxial MAPbI 3 SCF (Horvath et al, 2014;Mi et al, 2017;Wu et al, 2020).…”

All-inorganic CsPbBr3 perovskite: a promising choice for photovoltaics

“…However, the organicinorganic hybrid PSCs suffers from compositional degradation under heat and moisture mainly arising from the high volatility of the organic cations [18][19][20]. The organic cations such as MA + and FA + are expected to react with the water molecules or under ambient thermal environment to form hydrates, which cause the instability and degradation of the device [21][22][23][24][25][26]. The instability of the organic cation based PSCs is a critical flaw which impedes the commercialization of PSCs.…”

Recent Progress of All‐Bromide Inorganic Perovskite Solar Cells

“…[8,9] However, phase instability of OIH-PSCs under external stimuli such as moisture, heat, light, and oxygen impedes their further application because of the volatility of the organic constituents in these materials (such as MA þ , FA þ , or mixed cations) and the weak chemical bonding energies between metal cations (Pb 2þ ) and halide anions (I À , Br À , or Cl À ). [10][11][12][13][14][15] Despite of several strategies developed to improve the stability of OIH-PSCs (e.g., employment of inorganic cation doping, [16][17][18][19] surface modification with stable materials, [20][21][22] advanced encapsulation techniques [23][24][25] ), the intrinsically unstable nature of hybrid perovskite materials is still a pending issue for commercial applications with long-term stability.Different from OIH-PSCs, inorganic PSCs demonstrate excellent moisture and thermal stability by substituting the organic cations (MA þ /FA þ ) with inorganic ones (Cs þ ). [26,27] There are three basic types, based on different halides, i.e., CsPbI 3 , CsPbBr 3 , and CsPbCl 3 .…”