Highly efficient and stable dye-sensitized solar cells based on SnO 2 nanocrystals prepared by microwave-assisted synthesis
2011; Royal Society of Chemistry; Volume: 5; Issue: 1 Linguagem: Inglês
10.1039/c1ee02115j
ISSN1754-5706
AutoresAlexander Birkel, Yong-Gun Lee, Dominik Koll, Xavier Van Meerbeek, Stefan Frank, Mi Jin Choi, Yong Soo Kang, Kookheon Char, Wolfgang Tremel,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoHighly efficient dye-sensitized solar cells (DSSCs) with excellent long-term stability were fabricated based on tin(IV) oxide (SnO2) nanocrystals with tunable morphologies and band energy levels. The nanocrystals were prepared by a facile, fast, and energy-saving microwave-assisted solvothermal reaction. Through variation of the precursor base used during nanocrystal synthesis control over morphology was achieved—precursor metal cations are known to have a strong influence on the growth process of SnO2 nanostructures. A simple and economic way to prepare semiconducting pastes for photoanodes was devised. The photovoltaic performance of dye-sensitized solar cells based on SnO2 photoanodes was investigated. A very high power conversion efficiency of up to 3.2%, based on very high Voc and comparable Jsc and FF [under 1 Sun condition (AM 1.5, 100 mW cm−2, with shading masks)] was achieved, reporting the highest efficiency value for the cells based on unmodified SnO2 nanocrystals so far. In order to elucidate the efficient cell behavior, electrochemical properties such as the charge transport in the photoanodes as well as SnO2/electrolyte interfacial properties were investigated. Uncharacteristically for DSSCs, all devices tested in the present study show an unusual long-term stability under ambient conditions over several weeks.
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