New Simple Process for Making Organic Solar Cells

University of California at Santa Barbara (UCSB) researchers have developed a simple processing technique that could cut the cost of organic photovoltaics and wearable electronics.

The development by the UCSB team working with three other universities is a new technique for manufacturing single-layer organic polymer solar cells that might very well move organic photovoltaics into a whole new generation of wearable devices and enable small-scale distributed power generation.

The simple doping solution-based process involves briefly immersing organic semiconductor films in a solution at room temperature. This technique, which could replace a more complex approach that requires vacuum processing, has the potential to affect many device platforms, including organic printed electronics, sensors, photodetectors and light-emitting diodes.

The researchers’ findings have been published in the journal Nature Materials.

Co-author Guillermo Bazan, director of UCSB’s Center for Polymers and Organic Solids said, “Because the new process is simple to use, general in terms of applicability and should be configurable into mass productions, it has the potential to greatly accelerate the widespread implementation of plastic electronics, of which solar cells are one example. One can see impacts in technologies ranging from light-emitting devices to transistors to transparent solar cells that can be incorporated into building design or greenhouses.”

Studied in many academic and industrial laboratories for two decades, organic solar cells have experienced a continuous and steady improvement in their power conversion efficiency with laboratory values reaching 13 percent compared to around 20 percent for commercial silicon-based cells. Though polymer-based cells are currently less efficient, they require less energy to produce than silicon cells and can be more easily recycled at the end of their lifetimes.

This new method, which provides a way of inducing p-type electrical doping in organic semiconductor films, offers a simpler alternative to the air-sensitive molybdenum oxide layers used in the most efficient polymer solar cells.  Thin films of organic semiconductors and their blends are immersed in polyoxometalate solutions in nitromethane for a brief time – on the order of minutes.  The geometry of these new devices is unique as the functions of hole and electron collection are built into the light-absorbing active layer, resulting in the simplest single-layer geometry with few interfaces.

Co-author Thuc-Quyen Nguyen, a professor in UCSB’s Department of Chemistry and Biochemistry explained, “High-performing organic solar cells require a multiple layer device structure. The realization of single-layer photovoltaics with our approach will simplify the device fabrication process and therefore should reduce the cost. The initial lifetime testing of these single layer devices is promising. This exciting development will help transform organic photovoltaics into a commercial technology.”

Organic solar cells are unique within the context of providing transparent, flexible and easy-to-fabricate energy-producing devices. These could result in a host of novel applications, such as energy-harvesting windows and films that enable zero-cost farming by creating greenhouses that support crops and produce energy at the same time.

Driving down the cost of solar cells is important in every field of use. But the high volume low power device market can be huge and world wide. Driven to lower prices will only serve to push demand and larger volume for even larger markets.