研究目的
Investigating the charge transport in organic solar cells based on PTB7:PC71BM by measuring the J (V) characteristics at different temperatures and under illumination to understand the mechanisms governing the transport and photovoltaic conversion properties.
研究成果
The charge transport in PTB7:PC71BM based solar cells is governed by Ohmic law at low voltages and trapped charge limited current at high voltages, with conductivity dominated by the Poole–Frenkel effect at higher voltages. Under illumination, a power conversion efficiency of 6.49% was achieved, with JSC, VOC, and FF values comparable to other organic solar cells.
研究不足
The study is limited by the specific materials used (PTB7:PC71BM) and the conditions under which the measurements were taken (temperature range and illumination intensity). The comparison with other organic solar cells is based on literature values, which may vary due to different experimental conditions.
1：Experimental Design and Method Selection:
The study involved measuring the J (V) characteristics of PTB7:PC71BM based solar cells at different temperatures (140–325 K) in dark and under illumination. The charge transport mechanisms were analyzed using Ohmic law and trapped charge limited current models.
2：Sample Selection and Data Sources:
PTB7 and PC71BM were purchased from 1-Material and Solenne, respectively. The solar cells were fabricated using blends of PTB7:PC71BM dissolved in a solution of 1,2-dichlorobenzene.
3：List of Experimental Equipment and Materials:
A class A, sciencetech solar simulator was used for solar cells measurements. The intensity was calibrated using an ORIEL reference cell using KG5 filter.
4：Experimental Procedures and Operational Workflow:
The active layer was solution cast and put in a nitrogen glove box for drying. A semi-transparent top contact constituted of 15 nm of Ca and 15 nm of Al was deposited using thermal evaporation.
5：Data Analysis Methods:
The J–V characteristics were analyzed to determine the charge transport mechanisms and photovoltaic parameters such as JSC, VOC, FF, and η.
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