Improvement of performance and stability of polymer photovoltaic cells by WO<sub>3</sub>/CuPc as anode buffer layers

W1492437229 · 수집 2026-10-04 18:12:13

T10611 Conducting polymers and applications

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In this work, bulk-hetrojunction polymer photovoltaic cells based on poly-(3-hexylthiophene) (P3HT): [6, 6]-phenyl C61 butyric acid methyl ester (PCBM) were fabricated with tungsten oxide (WO 3 ) and copper phthalocyanine (CuPc) as anodic buffer layers. The WO 3 plays an important role in reducing the interfacial resistance, efficiently extracting holes and good band structure matching between the work function of the anode and the highest occupied molecular orbital of the organic material. The insertion of CuPc improves the device performance and expands the absorption spectra range of the photovoltaic devices. The effects of WO 3 and CuPc thickness on the performance of the photovoltaic devices were investigated. The optimum thicknesses of WO 3 and CuPc were 10 nm and 8 nm, respectively. The obtained power conversion efficiency of optimized cell was about 4.21%. Also, the device performance was analyzed based on the surface roughness of bare ITO and ITO that was covered with poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) or WO 3 /CuPc. The device stability in an ambient atmosphere without encapsulation under continuous light irradiation was also investigated. For the cell with PEDOT:PSS, the power conversion efficiency reduced down to 50% of the maximum value (half-life) after light irradiation for 12 h, while the half-life of device for WO 3 /CuPc was about 120 h. Therefore, the lifetime of unpackaged devices was improved with WO 3 /CuPc.

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