Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10123
標題: 探討銦含量對氮化銦鎵光伏元件影響
Characterization of InGaN-based photovoltaic by devices varying the Indium contents
作者: 謝文揚
Hsieh, Wen-Yang
關鍵字: InGaN
氮化銦鎵
Light-Emitting
Solar cell
Band Filling
Flat Band
發光二極體
太陽能電池
能帶充填效應
能帶平坦
出版社: 材料科學與工程學系所
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摘要: 本論文實驗以相同構結和尺寸氮化銦鎵光伏元件,探討銦含量不同所造成的發光二極體特性以及光伏特性之分析。 在順向偏壓下照射雷射光激螢光光譜,顯示隨順向偏壓增加波長會有紅移現象,造成較大紅移量,主要是因為較大壓電場造成,隨順向偏壓導致能帶傾斜較嚴重。而在隨電流注入的EL量測中發現較大藍移量以及效率衰退原因,主要來自於較大壓電場使得能帶更加傾斜造成電子電洞波函數重疊機率下降,造成載子輻射複合效率下降。 在隨不同雷射功率激發的光螢光光譜,發現藍光樣品不論在室溫或低溫下都有較高的光激螢光強度。由於綠光樣品較大壓電場造成載子不易侷限在量子井,使得在量子井中有效的輻射再結合載子數下降造成螢光強度下降。 在太陽能量測特性中,由於綠光樣品量子井中銦含量較高造成光譜吸收的範圍變寬。在照射全波段光源觀察到綠光樣品相對藍光樣品有高約89.5%的短路電流,但有略低的開路電壓值,並發現綠光有較佳的太陽能效率。綠光樣品有較高效率的太陽能電池特性是由於較寬的吸收光譜造成較大的短路電流。 在變溫下不同雷射功率照射藍光及綠光試片量測太陽能電池,造成低溫(10k)下太陽能效率較室溫(300k)較率差異較大,主因為在低溫(10K)下藍光及綠光載子的遷移率變低及ITO阻值變大造成串聯阻值變大,使填充因子變低進而造成效率明顯降低。 當氮化銦鎵摻雜銦含量增加時,因晶格不匹配使壓電場增加,造成能帶傾斜程度增加。在發光二極體特性量測,發現其波長偏移量增加、效率衰退也更加嚴重,但在溫室下因其能帶傾較嚴重,使載子的電子電洞波函數較分離不易侷限在量子井內容易因熱激活影響發生載子溢流的情況,形成光電流。在太陽能量測中,銦含量增加也使得短路電流(光電流)增加及開路電壓下降。
In this thesis, the analysis and measurements of the different characteristics of light-emitting diodes and photovoltaic properties with the same structure and size of InGaN photovoltaic devices were performed for the variation of indium content. For the forward bias photoluminescence spectra, the peak emission wavelength was red shifted by increasing of forward bias. The tendency of red-shift phenomenon resulted from the larger piezoelectric field in the InGaN active layer. For EL spectra with the injection currents, the larger of blue-shift and decay of efficiency were caused by the band filling effect in the tilted InGaN well with a larger piezoelectric field and reduce overlapping probability the electron-hole wave functions and decrease the carrier radiative recombination efficiency. According to the PL spectra with different laser power excitation, it is discovered that blue samples both had a higher intensity at room temperature or low temperature. On the other hand, the carriers were hard to confine in the MQW because of the large piezoelectric field in green LED samples. Therefore, it also made the decrease of PL intensity due to the decrease of effective numbers of carriers for recombination. By increasing the Indium content in InGaN active layer, the lattice mismatch induced large piezoelectric field was increased. In the solar measurements, the wide range of absorption spectra resulted from the higher indium content InGaN quantum wells of the green devices. Under the full-band light illuminated, the short-circuit current of the green device had a 89.5% enhancement and the slightly lower open-circuit voltage compared with the blue device.
URI: http://hdl.handle.net/11455/10123
其他識別: U0005-0908201116194000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0908201116194000
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