Hyung-Gu Jeong

Solution‐Processable Reduced Graphene Oxide as a Novel Alternative to PEDOT:PSS Hole Transport Layers for Highly Efficient and Stable Polymer Solar Cells

The potential of a fl exible, roll-to-roll manufacturing process has made bulk-heterojunction (BHJ) organic solar cells (OSCs) very attractive as a promising solution to energy and environmental issues. [ 1–8 ] In polymer solar cells, device characteristics such as fi ll factor (FF), short-circuit current density (J sc ) and open-circuit voltage (V oc ) as well as the cell life-time all are highly dependent on the interface properties between the electrodes and the active layers and on the bulk properties of the materials. [ 9 ] For these reasons, numerous modifi cations of electrodes by introduction of an interfacial layer have been studied intensively for high-performance and stable OSCs, [ 10–15 ] and several key factors such as transparency, conductivity, passivation property, fi lm morphology, stability, and solution-processability have been considered for uses of these promising interfacial layers. [ 9–15 ]

Efficient work-function engineering of solution-processed MoS2 thin-films for novel hole and electron transport layers leading to high-performance polymer solar cells

The work-function of MoS2 interfacial layers can be efficiently modulated by p- and n-doping treatments. As a result, the PCE of devices with a p-doped MoS2-based HTL is increased from ∼2.8 to ∼3.4%. Particularly, after n-doping the PCE was dramatically increased due to the change in work-function compared with un-doped MoS2 thin-films.