有機高分子太陽能電池之光電流功率相關性與外部量子效率分析

The Power Dependence of Photocurrent and the Calibration of Incident Photons to Electrons Conversion Efficiency of Polymer Solar Cells

劉佩雯(Pei-Wen Liu)

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(2010年)

https://doi.org/10.6843/NTHU.2010.00251

摘要

本研究主要針對P3HT與PCBM混合的BHJ（bulk heterojunction）結構做外部量子效率（External Quantum Efficiency, EQE）量測抑或稱為光電轉換效率（Incident photons into electrons convert efficiency, IPCE）量測的校正與分析。有機高分子太陽能電池引用著空間電荷侷限電流理論（Space charge limited current，SCLC），而目前的IPCE系統是使用弱光源，因此無法獲得真實的每波長下的頻譜響應（Spectral Response,SR(λ))，為了獲得真實的頻譜響應，所以將IPCE量測系統外加一個光偏壓（Light bias）源，光偏壓光源目的為使得元件操作於一個太陽光下的環境下（100mW/cm2）。然而文獻中指出引用SCLC理論的元件系統在強光照射下，元件電流與光強不為線性輸出，呈現power law型式，如I=cPα，α是由照強光下所獲得的修正項因子。最後，將加光偏壓的IPCE量測數據透過修正項的校正，可獲得一個正確的頻譜響應。

關鍵字

有機太陽能電池 ； 光電轉換效率 ； 空間電荷侷限電流

並列摘要

In our research, we focus on the calibration of incident photons to electrons conversion efficiency （IPCE） of the bulk hetero-junction structure of polymer solar cells. The charge transport behavior of polymer solar cell under global AM1.5 (AM1.5G, 100mAcm-2) illumination is described by the space charge limited current (SCLC) theory. However, most IPCE measurement are carried under weak light intensity so we can not obtain the real spectral response per wavelength (SR(λ)) . In order to acquire the real SR, we add the light bias source in the IPCE system then the devices can be operated under the strong light intensity. Based on SCLC theory, the relation of photocurrent density and light intensity can be expressed as a power law equation which is I=cPα where α is correct factor when the devices is illuminated under strong light intensity. Finally, we correct the SR(λ) of IPCE system with light bias source by the correct factor, and we get the accurate SR.

並列關鍵字

OPVs ； IPCE ； SCLC

參考文獻

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