All solution-processed organic photocathodes with increased efficiency and stability via the tuning of the hole-extracting layer †

T Bourgeteau (1) , D Tondelier (2) , B Geffroy (1, 2) , R Brisse (1) , S Campidelli (1) , R Cornut (1) , Bruno Jousselme (1)

1 LICSEN - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
2 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]

Photoelectrodes based on solution-processed organic semiconductors are emerging as low-cost alternatives to crystalline semiconductors and platinum. In this work, the performance and stability of P3HT:PCBM\MoS 3-based photocathodes are considerably improved by changing the hole-extracting layer (HEL). Oxides such as reduced graphene oxide, nickel oxide or molybdenum oxide are deposited via solution processes. With MoO x , a photocurrent density of 2 mA cm À2 during 1 h is obtained with the processing temperature lower than 150 C – thus compatible with flexible substrates. Furthermore, we show that the performances are directly correlated with the work function of the HEL material, and the comparison with solid-state solar cells shows that efficient HELs are not the same for the two types of devices.

Domains: Chemical Sciences; Material chemistry

T Bourgeteau, D Tondelier, B Geffroy, R Brisse, S Campidelli, et al.. All solution-processed organic photocathodes with increased efficiency and stability via the tuning of the hole-extracting layer †. Journal of Materials Chemistry A, 2016, 4, pp.4831-4839. ⟨10.1039/c6ta01320a⟩. ⟨cea-01332015⟩