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Advanced Design, Fabrication, and Applications of 3D-Printable Piezoelectric Nanogenerators
M. A. Parvez Mahmud,Partho Adhikary,Ali Zolfagharian,Scott Adams,Akif Kaynak,Abbas Z. Kouzani 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
Piezoelectric nanogenerator (PENG) is a leading-edge mechanical energy harvesting device used in portable power supplyand self-powered sensor systems. Advanced 3D printers have been recently used to create 3D printed (3DP) PENGs. This hasfacilitated the rapid fabrication of PENGs and their integration into wearable electronics, biomedical systems, and internetof things devices. However, researchers face several critical challenges in developing robust 3DP-PENGs that can produceadequate electrical energy for self-powered systems. Therefore, this review on 3DP-PENGs is conducted to highlight theirrecent developments and challenges. This paper presents the latest 3D-printed piezoelectric nanogenerators in terms of theirmaterials selection and functionalization, design and architecture formation, and applications including pressure sensors,fl ow sensors, microphones, and implants. Finally, crucial challenges and optimization strategies that considerably impactthe output performance of 3DP-PENGs, along with a roadmap for their future enhancement are given. It is envisioned thatthis work will help reduce the gap between 3D printing and PENG technologies and accelerate the research and developmentof 3DP-PENGs.
Strain Dependent Performance Analysis of InGaN Multi-junction Solar Cell
Md. Aminur Rahman,Md. Jahirul Islam,Md. Rafiqul Islam,M. A. Parvez Mahmud 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (MJSC) for the first time. The route of strain in MJSC is identifi ed to be the results of dissimilar lattice constants between layers of sub-cell grown epitaxially with bandgap stepping. Utilising multi-layered strain model, the state of strain and its magnitude is evaluated for three types of MJSC structures referred to as MJSC-1, MJSC-2, and MJSC-3. It is found that the MJSC position-dependent strain is strongly dependent on the sub-cell thickness as well as on the number of sub-cells. Employing the MJSC position-dependent strain in combination with deformation potentials, strain-induced energy bandgap is calculated when imposed under tensile strain condition. Finally, the strain-dependent efficiencies of different MJSC structures are estimated and obtained to be lower with that of reported with strain effects over sighted. The loss of efficiency is identifi ed to be due to the open circuit voltage which decreases under tensile strain condition. Among the MJSC structures studied here, MJSC-3 with 7-layers is less efficient and its efficiency decreases up to 3.01% when strain effect is taken into consideration.