New schemes of room-temperature solution-processed carrier transport layers for high performance Organic/Inorganic Solar Cells

Abstract

Carrier (electron and hole) transport layers are important components in organic/inorganic optoelectronics such as organic solar cells (OSCs), perovskite solar cells, dye sensitized solar cells, organic light emitting diodes (OLEDs), etc which can favor the efficient transport of carriers between the photoactive layer and electrode as well as high optical transparency. Transition metal oxides are promising materials for carrier transport layers because of their good electrical properties, stability, and optical transmission. We propose and demonstrate several low-temperature solution-processed approaches for forming transparent and efficient metal oxide-based carrier transport layers including electron and hole transport layers [1-6]. With the incorporation of metal nanoparticles [7-10], the electrical and optical properties can be enhanced. The interesting features of the novel carrier extraction layers are low temperature (i.e. low cost), solution process (i.e. large area) and water free (i.e. compatible to most devices) for high performance optoelectronics [1-10]. In addition, we have also developed some room-temperature processed Ag nano-network which can serve as transparent flexible electrodes [11], With the knowledge of solution processed of organic and inorganic materials, we have recently proposed different approaches such as vacuum-Assisted thermal annealing of CH3NH3PbI3 for highly stable and efficient perovskite SCs with power conversion efficiency (PCE) of 14.5% and no hysteresis [12] (recently reached PCE of 17.5% and no hystersis) and also demonstrated single junction OSCs with PCE of 10.5%.