研究目的
Evaluation of a PAni:PSS Layer-by-Layer (LbL) ultrathin film as hole transport layer (HTL) of Bulk Heterojunction Organic Solar Cells (OSC) and the importance of using a lithium fluorite (LiF) dielectric layer to improve devices overall performance.
研究成果
Bulk heterojunction OSC with PAni:PSS LbL films as HTL exhibits better performance compared to devices with no HTL, with the best results obtained for devices using five bilayers. The addition of a LiF dielectric layer further improves performance, increasing PCE to 2.14%. Device performance can be further improved by fine tuning the properties of the LbL HTL.
研究不足
The performance of devices decreases as the number of PAni:PSS bilayers increases beyond five, possibly due to higher thickness producing significant trap density for holes. Devices without HTL exhibit significant electrical instability.
1：Experimental Design and Method Selection:
Fabrication of Bulk Heterojunction OSCs with PAni:PSS LbL films as HTL and evaluation of their performance with and without LiF dielectric layer.
2：Sample Selection and Data Sources:
Use of Indium Tin Oxide (ITO) onto glass as substrate, P3HT and PCBM as active layer, and LiF and aluminum as anode.
3：List of Experimental Equipment and Materials:
Sourcemeter Keithley 2400 series, dichroic lamp calibrated to produce 100 mW/cm2 at standard AM
4：5 irradiance, reference solar cell from Oriel model 91150V. Experimental Procedures and Operational Workflow:
Deposition of PAni:PSS LbL films, spin-coating of active layer, thermal evaporation of LiF and aluminum anode, encapsulation in a glovebox system.
5：Data Analysis Methods:
Extraction and calculation of parameters from J-V curves under standard illumination.
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