利用奈米銦粒表面電漿子改進三接面砷化鎵太陽能電池電流匹配之研究

本論文是藉由奈米金屬粒子表面電漿效應改進三接面砷化鎵太陽能電池(Triple-Junction GaAs Solar Cells)電流匹配(Current Matching)之研究。將銦(Indium)奈米粒子形成在有二氧化鈦(TiO2)鈍化層的三接面砷化鎵太陽能電池上，透過奈米金屬粒子表面電漿效應使電場侷域性增強，增加半導體長波長光的吸收，由於光吸收的增加讓中間層太陽能電池之光電流提升，促使三接面砷化鎵太陽能電池之效率提高。本論文利用電子槍依序蒸鍍二氧化鈦和銦薄膜於玻璃基板及三接面砷化鎵太陽能電池，蒸鍍完成之試片放入氫氣爐以200 0C及30分鐘退火處理後形成我們要的奈米金屬粒子。藉由穿透率和外部量子效率之量測，本文完成之銦奈米粒子的共振波段大約為700~900 nm。在AM1.5G、25°C條件下，量測所完成之三接面砷化鎵裸太陽能電池之特性如下:開路電壓(Open circuit voltage, Voc)為2.52 V，短路電流密度(Short circuit current, Isc)為9.87 mA/cm2，填充因子(Fill factor, FF)為87 %，轉換效率(Conversion Efficiency, η)為21.8 %；由外部量子效率儀器模擬出的頂層太陽能電池電流密度為11.49 mA/cm2，中間層太陽能電池電流密度為9.1 mA/cm2。其次，在裸電池經蒸鍍完單層TiO2(50 nm)的鈍化層和In(3.8 nm)及退火處理後，開路電壓為2.52 V，短路電流密度為11.47 mA/cm2，填充因子為87 %，轉換效率提升至25.2 %；及經外部量子效率儀器模擬出的頂層太陽能電池電流密度為14.05 mA/cm2，中間層太陽能電池電流密度為11.35 mA/cm2。經比較分析，有奈米銦粒表面電漿子之三接面砷化鎵太陽能電池其短路電流密度共提升9.6 %，轉換效率共提升9.1 %。

關鍵字

砷化鎵太陽能電池；表面電漿銦奈米粒子；電流匹配；外部量子效率

並列摘要

This thesis is focused on improvement of the current matching in triple-junction GaAs solar cell by surface plasmon effect of nano-metallic particles.The indium nanoparticles are deposited on the surface of triple-junction GaAs solar cell with a passivation layer of TiO2. The electric field localized on the surface was enhanced by In nanoparticals plasmon. It lead to the increase of the absorption at the long wavelength in semiconductor. Thus the photocurrent of the middle cell was raised up and caused the increase in photovoltaic efficiency. In the experiment, we use the E-beam thermal evaporator to deposit a TiO2 and an Indium film on the glass substrate and triple-junction GaAs solar cell. After film deposition, we treated the samples at 2000C thermally annealed in H2 for 30 minutes to form the nano-metallic particles. According to the transmission spectrum and external quantum efficiency measurement, the range of wavelength in plasmon resonance was about 700~900 nm. Under AM 1.5G of illumination at 25°C, the obtained characteristics of the bare-type triple-junction GaAs solar cell are as the following: the open circuit voltage (Voc) is 2.52 V, the short-circuit current (Isc) is 9.87 mA/cm2, the fill factor is 86 %, and the conversion efficiency(η) is 21.8 %; from the external quantum efficiency characteristics, the calculated current density in top-cell is 11.49 mA/cm2, and the middlecell is 9.1 mA/cm2. After evaporated the passivation TiO2 of 50 nm and of In 3.8 nm upon the bare cell and thermally annealed, the Voc is 2.52 V, the Isc is 11.47 mA/cm2, the fill factor is 87 % , and the conversion efficiency is 25.2 %; the top cell current density is 14.05 mA/cm2, and the middle cell current density is 11.35 mA/cm2. Comparing with bare-type cell, the performance of triple-junction GaAs solar cell with In nano-particles show that the Isc is increased 9.6 %, and the conversion efficiency is increased 9.1 %.

並列關鍵字

GaAs solar cell ； Surface plasmonic ； Indium nanoparticles ； Current matching ； External quantum efficiency

參考文獻

[1] Jianhua Zhao, Aihua Wang, and Martin A. Green “19.8% efficient honeycomb textured multicrystalline and 24.4% monocrystalline silicon solar cells,” Appl. Phys. Lett, 1998, 73, pp. 1991-1993.

Alexander Wekkeli, Elke Welser, Eduard Oliva, Andreas W. Bett, and Frank

Dimroth “Current-matched triple-junction solar cell reaching 41.1% conversion

[6] D. M. Chapin, C. S. Fuller, G. L. Pearson “A New Silicon P-N Junction Photocell for Converting Solar Radiation into Electrical Power,” J.Appl. Phys. Lett, Vol.25, 1954, pp. 676.

[7] R. W. Birkmire and L. L. Kazmerski “Photovoltaics for the 21st Century,” Electrochemical Society, New Jersey, US, 2000, pp. 274-299.

國際替代計量

利用奈米銦粒表面電漿子改進三接面砷化鎵太陽能電池電流匹配之研究

全文下載

主題瀏覽