Highly Efficient Organic Photosensitizer with Dinaphthylphenylamine Unit as a Donor for DSSCs

摘要

Recently, dye-sensitized solar cells (DSSCs) have attracted great attention because they have advantages in converting solar energy to electrical energy at low cost. One of the key issues in high performance DSSCs is the rational design of the photosensitizers, which can exhibit high solar-to-energy conversion efficiency. The Ru complex photosensitizers such as N3, N719 and Black dye exhibit efficiencies about 11% under AM 1.5G irradiation. The performance of organic dyes for use as a photosensitizer has remarkably been improved showing high efficiencies over 9%. Organic dyes can provide structural diversity for tuning the photophysical properties such as absorption wavelength, molar extinciton coefficient, and HOMO-LUMO energy level. Efficient organic dyes include coumarin, indo-line, squaraine, polyene, hemicyanine, oligothio-phene, perylene, porphyrin, merocyanine and cyanine as the characteristic structural units. In particular, π-conju-gated molecules with electron donor-acceptor moieties for effective intramolecular charge transfer showed high efficiencies for DSSC.