Ahmed C. Kadhim

Variation in efficiency with change in band gap and thickness in thin film amorphous silicon tandem heterojunction solar cells with AFORS-HET

Numerical simulation of both single and double absorbing layers in amorphous silicon thin film solar cell is performed with the use of AFORS-HET. A single absorbing layer solar cell with both a-SiH and a-SiGeH is designed and compared with a tandem heterojunction solar cell, a-SiC/a-SiH/a-Si(i)/a-SiGeH. Design parameters are investigated, compared and optimized. The maximum efficiency for each single absorbing layer and for a tandem heterojunction thin film solar cell, a-SiC/a-SiH/a-Si(i)/a-SiGeH, is predicted. The results are validated by comparing with two different method of analysis.

Computer analysis of microcrystalline silicon hetero-junction solar cell with lumerical FDTD/DEVICE

The computer analysis of tandem solar cell, c-Si/a-Si:H/μc-SiGe, is studied within Lumerical FDTD/Device 4.6. The optical characterization is performed in FDTD and then total generation rate is tra...

A novel method for generating a low temperature coefficient (TC) reference voltage from high TC reference cells to achieve wide temperature stability for remote sensors

This paper presents a novel functional block level abstraction for generating a stable reference voltage over a wide temperature range. The proposed method uses multiple high temperature coefficient (TC) reference sources to generates a low TC voltage. The proposed approach is demonstrated using four BiCMOS voltage reference cells, with 26.6ppm/C TC as an example to achieve 1.24ppm/C TC over a temperature range from −35°C to 160°C which is about 95% decrease in TC as per the simulated values. The proposed solution can be scaled to employ multiple cost effective, non-ideal reference voltage generators with high TC and shorter temperature range, to produce a reference voltage with a low TC over wider temperature range for various applications including bionics and deep space vehicles.

Variation in Efficiency with Respect to Change in Band Gap and Thickness in Thin Film Amorphous Silicon Tandem Heterojunction Solar Cells with AFORS-HET

Simulation of an amorphous silicon heterojunction thin film solar cell is performed. It is designed as a-SiC/a-Si(i)/a-Si:H/ and a-SiC/a-Si(i)/a-SiGe:H for optimizing of device parameters and increasing the efficiency.

Investigating Link Budget of Underwater Wireless Optical Communication with Intensity Modulation Direct Detection Technique

In this paper, we experimentally investigated power and S/N of error-free underwater wireless optical communication (UWOC) system over 7m link in laboratory tap water. Results show that salt and Maalox content decreases the received power.

Investigating The Performance Of Underwater Wireless Optical Communication with Intensity Modulation Direct Detection Technique

In this paper, the BER and losses are inspected experimentally in an underwater optical wireless communication system (UWOC) with different water types. Results show that salt and Maalox content increase BER and power losses.