25 research outputs found
Theoretical limits of the multistacked 1-D and 2-D microstructured inorganic solar cells
Recent studies in monocrystalline semiconductor solar cells are focused on mechanically stacking multiple cells from different materials to increase the power conversion efficiency. Although, the results show promising increase in the device performance, the cost remains as the main drawback. In this study, we calculated the theoretical limits of multistacked 1D and 2D microstructered inorganic monocrstalline solar cells. This system is studied for Si and Ge material pair. The results show promising improvements in the surface reflection due to enhanced light trapping caused by photon-microstructures interactions. The theoretical results are also supported with surface reflection and angular dependent power conversion efficiency measurements of 2D axial microwall solar cells. We address the challenge of cost reduction by proposing to use our recently reported mass-manufacturable fracture-transfer- printing method which enables the use of a monocrystalline substrate wafer for repeated fabrication of devices by consuming only few microns of materials in each layer of devices. We calculated thickness dependent power conversion efficiencies of multistacked Si/Ge microstructured solar cells and found the power conversion efficiency to saturate at %26 with a combined device thickness of 30 μm. Besides having benefits of fabricating low-cost, light weight, flexible, semi-transparent, and highly efficient devices, the proposed fabrication method is applicable for other III-V materials and compounds to further increase the power conversion efficiency above 35% range. © 2015 SPIE
Ensembles of indium phosphide nanowires: physical properties and functional devices integrated on non-single crystal platforms
Optimisation methodology for low-g microaccelerometer
10.1117/12.404894Proceedings of SPIE - The International Society for Optical Engineering4230128-139PSIS
Differential capacitive low-g microaccelerometer with m g resolution
10.1016/S0924-4247(00)00424-6Sensors and Actuators, A: Physical861-245-51SAAP
Efficient design of micromechanical gyroscopes
10.1088/0960-1317/12/6/327Journal of Micromechanics and Microengineering126948-954JMMI
An open-loop nano-positioning micromechanical digital-to-analog converter for grating light modulation
10.1109/LPT.2005.845717IEEE Photonics Technology Letters1751010-1012IPTL
Design and fabrication of a micromachined resonant gyroscope
International Journal of Electronics86101179-1191IJEL
A new design concept for vibrating microgyroscope
10.1117/12.404892Proceedings of SPIE - The International Society for Optical Engineering4230109-118PSIS
SCREAM micromachined high aspect ratio low-G microaccelerometer
Proceedings of SPIE - The International Society for Optical Engineering4019344-353PSIS
Optimised layout generator for microgyroscope
10.1117/12.404893Proceedings of SPIE - The International Society for Optical Engineering4230119-127PSIS