研究目的
Investigating the effects of hafnium oxide (HfO2) as a hole blocking layer (HBL) on the stability and degradation under air environment of inverted bulk heterojunction organic solar cells (iOSC).
研究成果
The use of HfO2 as HBL in iOSCs showed less degradation compared to ZnO, maintaining around 30% of the initial PCE after 1000 h under air environment. This indicates HfO2's potential for improving the stability of organic solar cells.
研究不足
The study was limited to unencapsulated devices exposed to air environment, which may not fully represent the degradation mechanisms in encapsulated devices under operational conditions.
1：Experimental Design and Method Selection:
The study involved the fabrication of inverted organic solar cells (iOSCs) with HfO2, PFN, and ZnO as HBLs. The HfO2 layers were deposited by thermal evaporation.
2：Sample Selection and Data Sources:
ITO-coated glass substrates were used, with PTB7 and PC70BM as donor and acceptor materials, respectively.
3：List of Experimental Equipment and Materials:
A solar simulator (Abet Technologies model 11000 class type A, Xenon arc) and a Keithley 2400 Source-Measure Unit were used for characterization.
4：Experimental Procedures and Operational Workflow:
The devices were fabricated with different HBLs and exposed to air for 1000 h to study degradation.
5：Data Analysis Methods:
The J-V characteristics were modeled using the ideal-diode equivalent circuit model, and performance parameters were extracted from the J-V curves.
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Source-Measure Unit
2400
Keithley
Used for measuring the current density–voltage (J–V) characteristics.
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solar simulator
11000 class type A
Abet Technologies
Used for characterizing the J-V characteristics of the devices under light and dark conditions.
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ITO-coated glass substrates
PsiOTec Ltd
Used as substrates for the fabrication of inverted organic solar cells.
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PTB7
One-material Company
Used as donor material in the active layer of the solar cells.
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PC70BM
Solenne BV
Used as acceptor material in the active layer of the solar cells.
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HfO2
Sigma-Aldrich
Used as hole blocking layer in the solar cells.
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ZnO
Sigma-Aldrich
Used as hole blocking layer in the solar cells for comparison.
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V2O5
Sigma-Aldrich
Used as part of the anode layer in the solar cells.
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silver wire
Testbourne Ltd
Used for the anode layer in the solar cells.
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