串接式太陽電池模擬研究

Study on Tandem Solar Cell by Simulation

王藜樺(Li-Hua Wang)

指導教授 ： 洪勝富

國立清華大學/電機資訊學院/光電工程研究所/碩士(2008年)

摘要

提高太陽電池的轉換效率成為近年來太陽能電池研究發展的重點，運用串接太陽電池結構是方法之ㄧ，了解串接太陽電池物理特性中電流匹配的重要性是本研究的目標。
本論文中我們用半導體模擬軟體ATLAS模擬，選擇InGaP/GaAs串接太陽電池的結構，照射固定總強度的光，並藉由改變兩個波長的光強度，控制上下兩電池吸光產生的光電流，產生上下電池電流匹配和不匹配的條件。並探討InGaP/GaAs串接太陽電池、單一InGaP上電池，以及單一GaAs下電池三種情況比較當兩電池匹配、上電池光電流較多、下電池光電流較多時太陽能電池整合的結果。
本論文模擬的結果中，當上下兩電池電流較匹配時，串接太陽電池輸出的短路電流Isc=-0.669901，能量轉換效率PCE=23.7%，當兩電池吸光的差越多使上下電池越不匹配時，轉換效率PCE和短路電流Isc越小，當上下兩電池吸光比1:49時，串接太陽電池輸出的短路電流Isc=-0.026829，能量轉換效率PCE=1.07%。可瞭解串接太陽電池中電流匹配可以得到更大的能量轉換效率PCE和較大的短路電流Isc。

關鍵字

III–V族太陽能電池 ； 串接式太陽電池 ； 電流匹配

並列摘要

There has been an intensive search for tandem solar cell since the structure improving power conversion efficiency. The object of this study is to understand the important of current match in tandem solar cell.
We use simulation software ATLAS to model InGaP/GaAs tandem solar cell. By illuminating fixed total light power and change two different wavelength’s power ratio to achieve current match and mismatch conditions. We compare the simulation result of InGaP/GaAs tandem solar cell, InGaP top cell and GaAs bottom cell.
In the result of simulation, Isc of InGaP/GaAs tandem cell is restricted between Isc of top cell and bottom cell. Voc of InGaP/GaAs tandem cell is about Voc of InGaP top cell and GaAs bottom cell add together. Tandem cell achieve the best short-circuit current of -0.669901, power conversion efficiency of 23.7% under current match condition. Short-circuit current and power conversion efficiency decrease as two cell current mismatch increase. When two cell absorb power ratio is 1:49, we get short-circuit current of -0.026829, power conversion efficiency of 1.07%. So current match can get better short-circuit current and power conversion efficiency.

並列關鍵字

III–V Solar Cell ； Tandem Solar Cell ； current match

參考文獻

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