Inorganic electrodes for hybrid solar cells

Flavio Santos Freitas^a^,^b, Ana Flavia Nogueira^b

^aIFSULDEMINAS, Poços de Caldas, Minas Gerais, Brazil

^bUniversity of Campinas - UNICAMP, Cidade Universitária Zeferino Vaz, Campinas, 13083, Brazil

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Flavio Santos Freitas, 431
Publication date: 5th February 2015

Polymer/inorganic nanocrystal hybrid solar cells have drawn considerable attention as a promising renewable energy source. These hybrid solar cells have several advantages over their pure inorganic counterparts. In this work, we present two different approaches for hybrid solar cells with the polymer poly-3-hexylthiophene (P3HT) [1,2]. The first one is the insertion of titanium dioxide (TiO₂) in two shapes (sphere and rod) blended with P3HT in inverted TiO₂/P3HT solar cells. The measured properties showed well dispersed nanoparticles in polymer matrix. Furthermore, the obtained efficiencies were similar (Figure 1a), but the devices showed distinctions in photocurrent (Isc), open-circuit voltage (Voc) and fill-factor (FF) values. These behaviours can be understood as due to the combination of the specific interfacial area and the number of inter-crystal junctions, increasing exciton splitting and charge mobility in the polymer [2]. In the second approach, a modification of Silicon/P3HT interface through the alquilation of the silicon surface for application in Al/Si/P3HT/Au devices. The characterization from X-ray photoelectron spectroscopy (XPS) showed the attachment of thiophene monomers. For solar cell applications, Schottky, Si/P3HT, and Si/modifier/P3HT devices (Figure 1b) were assembled in order to evaluate the photovoltaic properties of the Si/P3HT interface. A similar Voc was measured for all PV devices employing P3HT, indicating that this interface contributes to the photovoltaic response. Devices based on Si wafers modified by thiophene alquilation provided overall energy conversion efficiencies up to 8.0% [1]. We acknowledge support from CNPQ, INEO and FAPESP.
Figure 1 – IV curves for (a) inverted TiO2/P3HT and (b) Si/P3HT solar cells.
[1] Freitas, F. S., Merlo, R. B., Marques, F. C., Nogueira, A. F., Hybrid silicon/P3HT solar cells based on an interfacial modification with a molecular thiophene layer Phys. Status Solidi A, 211, 2657–2661 (2014). [2] Freitas, F. S., Silva, J. M. de S., Cardoso, M. B., Nogueira, A. F., Incorporation of nanocrystals with different dimensionalities in hybrid TiO2/P3HT solar cells, J. of Photonics for Energy, accepted.

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