Organic thin-film solar cell employing a novel electron-donor material

Improvement of photo-current density by alternative deposition method for organic photovoltaic cell

“…Solar cell parameters were drastically changed by device structures. Simple p-n heterojunction OPV cell showed good solar cell performance comparable to reported OPV cell [7]. The BHJ OPV cell showed poor solar cell performance, because DBP molecule and C60 molecules are perfectly mixed in active layer, which was observed by the cross-section SEM image.…”

“…ZnPc is a well known material for typical organic p-type semiconductor of OPV cell. On the other hand, DBP is new material for OPV cell reported by D. Fujishima et.al [7]. The p-n heterojunction OPV cells based on DBP show high open circuit voltage (Voc) of 0.92 V and high short-circuit current density (Jsc) due to the high absorption coefficient of DBP material.…”

Influence of the density of states on the open-circuit voltage in small-molecule solar cells

“…Fullerene in its C 60 and C 70 forms and its derivatives are the most successful electron acceptor materials, whereas a numerous collection of donor materials have been developed and studied in the previous decade. Among them, tetraphenyldibenzoperiflanthene (DBP) has recently appeared as a promising electron donor material for photovoltaic applications [7][8][9][10][11][12]. DBP has a symmetrical molecular structure (Fig.…”

“…allow a reduction in the thickness of the active layer, which is a favourable condition for the exciton to reach the donor-acceptor (D/A) interface. The HOMO energy of DBP is estimated to be 5.5 eV [7], which makes it suitable for its employment with fullerene acceptors. The relatively deep HOMO level of DBP can help to obtain a high opencircuit voltage (V OC ), since this can be related to the difference between the HOMO energy of the donor and the lowest unoccupied molecular orbital (LUMO) level of the acceptor [13].…”

Improvement in the open-circuit voltage of an organic photovoltaic device through selection of a suitable and low-lying highest occupied molecular orbital for the electron donor layer

“…Their group reported that an OPV using TPTPA exhibited a PCE of 1.7% with fullerene C 60 as the electron acceptor and 2.2% with fullerene C 70 as the electron acceptor. Meanwhile, some long wave length absorption electron donors, such as dicyanovinyl-appended oligothiophenes, 17 tetraphenyldibenzoperiflanthene, 18 and diindenoperylene, 19 have been proposed to achieve high performance. More recently, some D-A structure based materials have been reported to be showing a PCE of more than 3% in vacuumdeposited planar bilayer OPVs.…”