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Harvesting energy from the sun is attracting increasing attention due to the challenges arising from our continued dependence on fossil fuels. In the past two decades. polymer photovoltaics (PV) based on bulk-heterojunction (BHJ) structure have become a promising alternative energy option due to their lightweight properties. environmental friendliness. and solution processability.The capability for solution processing especially provides the possibility of fabricating organic devices on flexible substrates and over large device areas with relatively simple equipment and low costs. The certified power conversion efficiency (PCE) of organic PV (OPV) has already exceeded 12% by a combination of novel materials and morphology optimization. Due to the nature of molecular orbitals. the absorption spectra of organic semiconductors are not continuous as in inorganic semiconductors. This results in a major shortcoming for single-junction polymer PV devices in terms of their insufficient light absorption. However. this ‘‘disadvantage’’ of polymer PV can actually open a door to a new opportunity: visible region transparency.
