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Effect of structure and interlayer diffusion in organic position sensitive photodetectors based on complementary
Juan Cabanillas-Gonzalez1, Malte Schmidt, Ovidio Peña-Rodríguez
1Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049-Madrid, Spain.
Journal of Nanoscience and Nanotechnology
|August 2, 2013
Summary
Organic photodetectors using copper phthalocyanine (CuPc) and C60 wedge layers show spatially dependent spectral responses. Analysis reveals inter-diffusion layers impact device performance, influencing photocurrent and spectral characteristics.
Area of Science:
- Organic electronics
- Photodetector technology
- Materials science
Background:
- Organic photodetectors (OPDs) are crucial for flexible electronics.
- Understanding the donor-acceptor interface is key to optimizing OPD performance.
- Spatial variations in material properties can significantly affect device characteristics.
Purpose of the Study:
- To investigate the spatial dependence of spectral response in OPDs.
- To correlate photocurrent with local material properties.
- To elucidate the role of the donor-acceptor interface in device performance.
Main Methods:
- Fabrication of OPDs using complementary CuPc and C60 wedge layers.
- Photocurrent measurements under varying light spot positions.
- Correlation with Atomic Force Microscopy (AFM), micro-Raman, and ellipsometry mapping.
- Device modeling to compare experimental and theoretical photocurrent.
Main Results:
- Observed strong spatial dependence of spectral response.
- Mapped local donor/acceptor concentration, layer thickness, and interface nature.
- Identified deviations between experimental photocurrent and model predictions.
- Attributed deviations to inter-diffusion layers at the organic-organic interface.
Conclusions:
- The spectral response of CuPc/C60 OPDs is highly sensitive to the position of incident light.
- Inter-diffusion layers significantly influence the spatial dependence of photocurrent.
- Accurate modeling of OPDs requires consideration of non-abrupt interfaces.
