Quantifying Bimolecular Recombination in Organic Solar Cells in Steady State

摘要

Organic solar cells have shown rapid performance increase in recent years. For the development of new high-performance materials, reliable quantification of the loss mechanisms is indispensable. One of the main limiting factors in the power-conversion process in organic photovoltaics is the recombination of photogenerated charges. In an organic bulk-heterojunction solar cell, absorbed photons are converted into free holes and electrons that are transported through the donor and acceptor phases, respectively. However, free charge carriers may recombine bimolecularly instead of being extracted at the electrodes.