A generic interface to reduce the efficiency-stability-cost gap of perovskite solar cells

We present a generic interface architecture that combines solution-processed, reliable, and cost-efficient hole-transporting materials without compromising efficiency, stability, or scalability of perovskite solar cells. Tantalum-doped tungsten oxide (Ta-WOx)/conjugated polymer multilayers offer a surprisingly small interface barrier and form quasi-ohmic contacts universally with various scalable conjugated polymers. In a simple device with regular planar architecture and a self-assembled monolayer, Ta-WOx–doped interface–based perovskite solar cells achieve maximum efficiencies of 21.2% and offer more than 1000 hours of light stability. By eliminating additional ionic dopants, these findings open up the entire class of organics as scalable hole-transporting materials for perovskite solar cells.

Source: ScienceNOW - November 30, 2017 Category: Science Authors: Hou, Y., Du, X., Scheiner, S., McMeekin, D. P., Wang, Z., Li, N., Killian, M. S., Chen, H., Richter, M., Levchuk, I., Schrenker, N., Spiecker, E., Stubhan, T., Luechinger, N. A., Hirsch, A., Schmuki, P., Steinrück, H.-P., Fink, R. H., Halik, M., S Tags: Physics, Applied, Materials Science reports Source Type: news