Non-fullerene acceptors (NFAs) are a promising alternative to fullerene based electron acceptors. To a large extent, they have already taken the spotlight away from fullerene derivatives as the preferred acceptor in bulk-heterojunction organic solar cells (OSCs).
Historically speaking, PCBM, PC70BM, C60 and other fullerene derivatives have been the most widely used electron acceptors in organic photovoltaic (OPV) cells. Unfortunately, fullerene acceptors have a number of shortcomings which limit their performance in photovoltaic applications. These include weak light absorption, limited variability of electronic properties, and morphology instability. As a result of these drawbacks, it has proven difficult to obtain high power conversion efficiencies (PCEs) using these materials. Solving these problems is therefore crucial to the development of efficient, commercially viable, polymer photovoltaics.
The discovery of ITIC in 2015 brought about the first serious challenge to the role of fullerenes as acceptors in polymer solar cells. With a greater degree of flexibility to tune the optical properties and electronic energy levels, ITIC based organic solar cells offer greater thermal and photochemical stability, longer device lifetimes, and higher power conversion efficiencies.
The performance of NFA-based devices has now overtaken that of their fullerene-based cousins, with recent non-fullerene organic solar cells (NFOSCs) reaching power conversion efficiencies of over 17%. More research is needed before devices can be created with efficiencies that rival those of inorganic devices, but with the development of new non-fullerene acceptor materials, the first OPV cells with efficiencies in excess of 20% could be on the horizon.
We supply a range of the most promising n-type non-fullerene acceptors, including ITIC, N3, TPT10, Y6 and Y7. We have a collection of intermediates and NFA monomers available for the synthesis of such ITIC non-fullerene acceptors. Our range currently includes 2HIC, 2FIC, 2ClIC, IDTB6-2CHO and IDTTB6-2CHO. Please contact us if you can't find what you are looking for.