Coevaporated calcium‐silver metal alloys as contact for highly transparent organic solar cells
Energy Science & Engineering Wiley 2:2 (2014) 77-85
Increased open-circuit voltage of organic solar cells by reduced donor-acceptor interface area.
Advanced materials (Deerfield Beach, Fla.) 26:23 (2014) 3839-3843
Built-in voltage of organic bulk heterojuction p-i-n solar cells measured by electroabsorption spectroscopy
AIP Advances AIP Publishing 4:4 (2014) 047134
Correlation between temperature activation of charge-carrier generation efficiency and hole mobility in small-molecule donor materials.
Chemphyschem : a European journal of chemical physics and physical chemistry 15:6 (2014) 1049-1055
Abstract:
In organic solar cells, free charge carriers are generated at the interface between an electron-donating and an electron-accepting material. The detailed mechanisms of the generation of free charge carriers are still under discussion. In this work, we investigate the influence of temperature on the generation efficiency of free charge carriers in blends of dicyanovinyl substituted oligothiophene (DCVnT) molecules and C60 by quasi-steady-state photoinduced absorption (PIA) measurements. The observed positive temperature dependence of charge-carrier generation can be directly correlated to the charge-transport behavior. The determined activation energy scales inversely with the hole mobility for all investigated DCVnT derivatives, suggesting higher dissociation probability of bound interfacial charge pairs at high mobility. Furthermore, the energetic disorder parameter, σ, determined by CELIV (charge extraction by linearly increasing voltage) measurements for a DCV6T derivative, matches the activation energy from the PIA measurements. In conclusion, these results underline the need for high-mobility donor materials for optimal charge-pair dissociation in organic solar cells.Improved organic p-i-n type solar cells with n-doped fluorinated hexaazatrinaphthylene derivatives HATNA-F6 and HATNA-F12 as transparent electron transport material
Journal of Applied Physics AIP Publishing 115:5 (2014) 054515