Interconnected organic photovoltaic devices with enhanced efficiencies
Conjugated polymer-based solar cells have emerged as an attractive low-cost alternative to the traditional silicon-based photovoltaics. Sophisticated, energy-intensive processing technologies and expensive photoactive materials significantly contribute to the high cost of traditional solar cells. On the other hand, polymer-based photovoltaics rely on potentially inexpensive polymers that can be solution-processed in a roll-to-roll fashion using low-cost printing and spray deposition techniques. In our research, we seek to achieve higher power conversion efficiencies in OPV devices by improving established methods for nanostructuring their components and to develop simple low-cost processing techniques for interconnecting organic solar cells into monolithic arrays. The investigation is focused on three specific aims: develop a flexible nanoimprint mold capable of replicating dense sub-100 nm features in organic semiconducting polymers, improve efficiency of bulk heterojunction organic solar cells by creating a nanostructured donor–acceptor interface using nanoimprint lithography, and develop a microcontact printing technique capable of structuring and interconnecting all organic components of OPVs into monolithic series arrays.