Design and Optimize the Performance of Self-Powered Photodetector Based on PbS/TiS3 Heterostructure by SCAPS-1D

Abstract

Titanium trisulphide (TiS3) has been widely used in the field of optoelectronics owing to its superb optical and electronic characteristics. In this work, a self-powered photodetector using bulk PbS/TiS3 p-n heterojunction is numerically investigated and analyzed by a Solar Cell Capacitance Simulator in one-Dimension (SCAPS-1D) software. The energy bands, electron-holes generation or recombination rate, current density-voltage (J-V), and spectral response properties have been investigated by SCAPS-1D. To improve the performance of photodetectors, the influence of thickness, shallow acceptor or donor density, and defect density are investigated. By optimization, the optimal thickness of the TiS3 layer and PbS layer are determined to be 2.5 μm and 700 nm, respectively. The density of the superior shallow acceptor (donor) is 1015 (1022) cm−3. High quality TiS3 film is required with the defect density of about 1014 cm−3. For the PbS layer, the maximum defect density is 1017 cm−3. As a result, the photodetector based on the heterojunction with optimal parameters exhibits a good photoresponse from 300 nm to 1300 nm. Under the air mass 1.5 global tilt (AM 1.5G) illuminations, the optimal short-circuit current reaches 35.57 mA/cm2 and the open circuit voltage is about 870 mV. The responsivity (R) and a detectivity (D*) of the simulated photodetector are 0.36 A W−1 and 3.9 × 1013 Jones, respectively. The simulation result provides a promising research direction to further broaden the TiS3-based optoelectronic device.

Review of Metal Sulfide Nanostructures and their Applications

“…Schematic illustration of PbS synthesis routes with obtained morphologies and their applications. Reproduced with permission from refs , , , and . Copyrights 2019, 2019, 2020, and 2022, respectively.…”

Simulation-Based Performance Optimization and Mechanistic Analysis of CsPbIBr2/CsPbBr3 Stacked All-Inorganic Perovskite Solar Cells in Low-Temperature Working Environments

“…The construction of a layered structure is a common approach used to broaden the spectral response range, optimize the band structure, and enhance device stability. , Taking into account the previously mentioned beneficial complementary characteristics of CsPbIBr 2 and CsPbBr 3 , which are capable of forming a stacked configuration, this section delves into assessing the influence of employing versus omitting such a stacked structure on the performance of devices in low-temperature scenarios at 270 K.…”

Design and optimization of the performance of PbS quantum dot based vertical photodetector

“…m is the electron (hole) mobility and D n p ( ) is the diffusion coefficient of electrons (holes). The quantum efficiency (QE), responsivity (R), detectivity (D*), and switch ratio (ratio of light on and light off currents at a given voltage point) [20,[23][24][25] are important parameters of the photodetector. Once the current characteristics of the structure are calculated using SCAPS, these parameters are calculated according to the following equations [26]:…”

“…Vertical photodetectors often use the same structure and materials as solar cells. Therefore, we chose the 1D solar cell simulation software SCAPS for the numerical simulation of photodetectors [19,20]. However, photodetectors and solar cells are concerned with different physical properties, which requires additional treatment and analysis of the calculated results to further optimize the detector design.…”