DECODING THE MYSTERY OF ADDITIVES IN ORGANIC SOLAR CELLS

摘要

Solvent additives are prevalent in today’s high-performance organic photovoltaics(OPVs), 1 yet the mechanism underlying their role in improving power conversion efficiency(PCE)has remained elusive.The general picture of a correlation between solvent constituents and the morphology within the deposited active layer film is clear,but the nature of this correlation is unknown—and it must be deciphered in order to adopt a more rational approach to improving device function.Using a combination of characterization techniques including x-ray and neutron scattering as well as advanced electron microscopy,we probe the influence of additives on active layer morphology in several state-of-the-art bulk heterojunction(BHJ)blend systems.Through the integrated analysis of real-and reciprocal-space data,we uncover new insights into the role of additives that can be generalized across multiple materials.