Enhanced Performance of a Self‐Powered Organic/Inorganic Photodetector by Pyro‐Phototronic and Piezo‐Phototronic Effects

Abstract

Self-powered photodetectors (PDs) have long been realized by utilizing photovoltaic effect and their performances can be effectively enhanced by introducing the piezo-phototronic effect. Recently, a novel pyro-phototronic effect is invented as an alternative approach for performance enhancement of self-powered PDs. Here, a self-powered organic/inorganic PD is demonstrated and the influences of externally applied strain on the pyro-phototronic and the photovoltaic effects are thoroughly investigated. Under 325 nm 2.30 mW cm UV illumination and at a -0.45% compressive strain, the PD's photocurrent is dramatically enhanced from ≈14.5 to ≈103 nA by combining the pyro-phototronic and piezo-phototronic effects together, showing a significant improvement of over 600%. Theoretical simulations have been carried out via the finite element method to propose the underlying working mechanism. Moreover, the pyro-phototronic effect can be introduced by applying a -0.45% compressive strain to greatly enhance the PD's response to 442 nm illumination, including photocurrent, rise time, and fall time. This work provides in-depth understandings about the pyro-phototronic and the piezo-phototronic effects on the performances of self-powered PD to light sources with different wavelengths and indicates huge potential of these two effects in optoelectronic devices.

Ultrabroadband, Large Sensitivity Position Sensitivity Detector Based on a Bi2Te2.7Se0.3/Si Heterojunction and Its Performance Improvement by Pyro‐Phototronic Effect

“…However, for traditional photodetectors, the pyro-phototronic effect usually improves both the rise and the fall times, [62][63][64][65][66] which is inconsistent with our results. However, for traditional photodetectors, the pyro-phototronic effect usually improves both the rise and the fall times, [62][63][64][65][66] which is inconsistent with our results.…”

“…Therefore, these carriers are more easily swept away by the enhanced field and quickly transmitted into the Bi 2 Te 2.7 Se 0.3 and the Si layers. [62][63][64][65][66] Firstly, the LPV-t curves were identified under different power illuminations of a 532 nm laser at 1000 Hz with laser beam staying at x = 0.36 mm, as shown in Figure 6b. [59,60] www.advelectronicmat.de At last, the response speed, as another key parameter of a photodetector, [34,61] is also well studied in the Bi 2 Te 2.7 Se 0.3 / Si heterojunction.…”

“…When suddenly turning off the laser (Stage III), a temperature decrease is instantaneously happened, resulting in an opposite longitudinal pyroelectric potential (as compared with stage I), as shown in Figure 7d. [62][63][64][65][66] Moreover, it is suggested that a faithful PSD should exhibit a wide bandwidth to make it collect a reliable optical signal over the entire bandwidth and the response speed obtained at high pulse frequencies may be more accuracy due to the longer time taken on the laser on stage at low frequencies. At last, the temperature returns back and keeps constant as room temperature (Stage VI), so that the pyroelectric potential is disappeared, and the LPV still keeps at zero in this stage (Figure 7e).…”

Translucent Photodetector with Blended Nanowires–Metal Oxide Transparent Selective Electrode Utilizing Photovoltaic and Pyro‐Phototronic Coupling Effect

“…Additionally, a recently revealed photoinduced pyroelectric potential, known as the pyro‐phototronic effect, has been utilized by coupling with the built‐in potential, to design high‐performing optoelectronic devices . The pyro‐phototronic potential is generated across a noncentrosymmetric crystal structure such as ZnO, SnS, and BiFe 2 O 3 due to an instantaneous temperature change in the material on illumination . However, we like to demonstrate that the generation of pyro‐phototronic voltage is not sufficient, but its effective utilization is an important factor to enhance the device performance, which indeed required a suitable contact.…”

Design and tailoring of patterned ZnO nanostructures for energy conversion applications

“…Nanogenerators (NG) are among the most common devices used to convert mechanical energy produced by mechanical vibration, body movement, airflow, and hydraulic energy into electrical energy at the nanometer scale [145][146][147][148]. Vertically aligned ZnO NAs have been widely used in NG devices, by virtue of the piezoelectric effect [149][150][151].…”