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QUANTUM EFFICIENCY MEASUREMENTS OF CuIn1-xGaxSe2 SOLAR CELLS |
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| รหัสดีโอไอ | |
| Title | QUANTUM EFFICIENCY MEASUREMENTS OF CuIn1-xGaxSe2 SOLAR CELLS |
| Creator | Supathat Sukaiem |
| Contributor | Sojiphong Chatraphorn |
| Publisher | Chulalongkorn University |
| Publication Year | 2557 |
| Keyword | Copper indium selenide, Solar cells, Quantum electrodynamics, คอปเปอร์อินเดียมซิลิไนด์, เซลล์แสงอาทิตย์, พลศาสตร์ไฟฟ้าควอนตัม |
| Abstract | Quantum efficiency (QE) measurement is one of several methods used to investigate solar cell performance, especially the carrier collection. It indicates the amount of photogenerated current produced when a solar cell is illuminated by photons of a particular wavelength. In this study, a quantum efficiency measurement system was constructed and the CuIn1-xGaxSe2 (CIGS) – based thin film solar cells with different growth conditions were characterized. The results show an influence of differences in band gap energy on photo-current collection. The changing in collected current and absorption edges can be observed. In addition, quantum efficiency measurement is used to identify the properties of each thin film layer comprising the devices. The current leakage due to a defective p-n junction leads to abrupt drops in QE curve at some particular wavelengths. However, not only the basic quantum efficiency measurement was employed but the lock-in amplifier technique was also used in this system in order to enhance signal-to-noise ratio. The results of both techniques were compared and exhibited an improvement of data acquisition. Finally, the effect of voltage bias applied to solar cells for demonstrating more realistic performance was observed. The results showed slight reduction of the photocurrent collection due to narrower space-charge region when solar cells operate in practical condition. |
| URL Website | cuir.car.chula.ac.th |
