Role of Photogenerated Iodine on the Energy-Conversion Properties of MoSe Nanoflake Liquid Junction Photovoltaics.

Transition metal dichalcogenides (TMDs) such as MoSe and WSe are efficient materials for converting solar energy to electrical energy in photoelectrochemical photovoltaic cells. One limiting factor of these liquid junction solar cells is that photogenerated oxidation products accumulate on the electrode surface and decrease the photocurrent efficiency. However, it is unclear where the reaction products accumulate on the electrode surface and how they impact the local photoelectrochemical response.