Solar cells on CMOS chips as energy harvesters - integration and CMOS compatibility


Lu, Jiwu (2011) Solar cells on CMOS chips as energy harvesters - integration and CMOS compatibility. thesis.

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Abstract:Energy harvesting is an interesting topic in the 21st century for electrical engineers from both industry and academia. It will be a core technology for autonomous wireless networks, which is the essential component of the long-lived ubiquitous computing world.
There are different ways to achieve the energy harvesting goal, and each of them has its own pros and cons. In this thesis, we focused on monolithic integration of an energy harvester on top of CMOS chips by CMOS compati-ble post-processing technologies, and two approaches have been studied.
Chapter 2 describes the first approach which is an integrated electromag-netic energy harvester, which aims to scavenging kinetic energy of the mechanical vibrations in the environment. The numerical simulations show that our EM energy harvester design can offer a power output at microwatts level, which is consistent with experimental results from other groups. However due to the absence of some required instruments and the frequency match challenge (page 28), the experimental realization was not carried out.
Chapter 3 to 5 describe the second approach which is integrated solar cells on top of CMOS chips without changing either the standard CMOS process-ing or the conventional solar cell technology. The integrated solar cells will harvest energy from light and transfer to the underneath CMOS circuits. After detailed consideration, a-Si solar cells and CIGS solar cells were chosen to be integrated on CMOS chips.
Item Type:Thesis
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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