Enhanced charge mobility in a molecular hole transporter via addition of redox inactive ionic dopant: Implication to dye-sensitized solar cells

Journal article

Upon the addition of lithium salts to the hole-transporter matrix, 2, 2′, 7, 7′ -tetrakis (N,N -di- p -methoxypheny-amine)- 9, 9′ -spirobifluorene (spiro-MeOTAD), the authors observe a 100-fold increase in conductivity through spiro-MeOTAD within a Ti O2 mesoporous network. The authors demonstrate this to be a bulk effect and not due to improved injection at the electrodes. By testing "hole-only" diodes of pure spiro-MeOTAD and those doped with lithium salts, the authors calculate that the hole mobility increases from 1.6× 10-4 to 1.6× 10-3 cm2 V s. The authors discuss the possible mechanisms for this significant enhancement in charge mobility and its implication to the dye-sensitized solar cell operation. © 2006 American Institute of Physics.

Authors: Snaith, H; Graetzel, M

• Publication status: Published
• Journal: APPLIED PHYSICS LETTERS
• Volume: 89
• Issue: 26
• Pages: 262114-262114
• Publication date: 2006-12-25
• DOI: 10.1063/1.2424552
• ISSN: 0003-6951
• Language: English