Hybrid Solar Cells Based on CdS Nanowire Arrays

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Three types of hybrid solar cells based on CdS nanowire crystals have been prepared, i.e., (i) nanocrystal - polymer, (ii) nanocrystal - dye and (iii) nanocrystal - organic donor-acceptor bulk heterojunction (BHJ), and the role of CdS layer in each of the above structures has been elucidated. It has been found that CdS plays the active role of acceptor in the first two types of solar cells, whereas it plays the role of an electron-transporting (hole-blocking) layer to rectify electron flow from the organic donor-acceptor BHJ to anode in the case (iii). By changing morphology of the CdS layer from a textured continuous film to a nanowire array we demonstrate an improved efficiency of collection of charge carriers due to the increased organic-CdS interface area. Overall, a bifunctional role of the CdS nanostructured layer as a bottom electrode with a high electron affinity and as a means to increase a hybrid interface for better electron collection from the organic active layer has been demonstrated.

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Edited by:

Alexei N. Nazarov, Volodymyr S. Lysenko and Denis Flandre

Pages:

75-82

Citation:

D.O. Grynko et al., "Hybrid Solar Cells Based on CdS Nanowire Arrays", Advanced Materials Research, Vol. 854, pp. 75-82, 2014

Online since:

November 2013

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$38.00

230 24.

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[2] 2·10-3 ITO/CdS/ZnPc-4R/PEDOT: PSS-PEO Textured film.

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[2] 9·10-5 ITO/CdS/P3HT/ PEDOT: PSS Nanowire array.

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[1] 0·10-2 ITO/CdS/ZnPc-4R/PEDOT: PSS-PEO Nanowire array.

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[1] 3.

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[1] 5·10-5 Fig 3. Current-voltage characteristics of PV cells shown in Table 1, based on (1) textured and (2) NW array CdS layers. Nanocrystal - organic inverted cell. We concentrate here on the P3HT: PCBM BHJ which produces dissociated electron-hole pairs within the organic layer quite efficiently. As known, the P3HT: PCBM BHJ sandwiched between the respective electrodes, for example, an ITO/PEDOT: PSS/P3HT: PCBM/Al structure can demonstrate PCE approaching 5 % [] W. Ma, C. Yang, X. Gong, K. Lee, A.J. Heeger, Thermally stable, efficient polymer solar cells with nanoscale control of the interpenetrating network morphology, Adv. Funct. Mater. 15 (2005).

DOI: https://doi.org/10.1063/1.4898233

27 89.

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[5] 0·10-3 Nanowire array.

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[3] 3·10-2 Although CdS has recently been demonstrated as an electron-selective layer in organic inverted solar cells [] N. Yavuz, S.A. Yuksel, A. Karsli, S. Gunes, Inverted structure hybrid solar cells using CdS thin films, Sol. Energy Mater. Sol. Cells 116 (2013).

DOI: https://doi.org/10.1016/j.solmat.2013.04.018

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