Synthesis And Performance Study Of Non-fullerene Single Component Organic Solar Cells

The main advantages of organic semiconductors include a wide range of material sources,roll to roll processing,high structural controllability,and translucency,which have the potential to become materials for the preparation of large area flexible solar cells,with outstanding research value and broad application prospects.In recent years,organic solar cells have gradually attracted the attention of scientists.At present,due to excessive phase separation caused by long-term illumination and high ambient temperature,the D-A interface of two-component organic solar cells is reduced,and device efficiency is reduced.Single component organic solar cells can effectively solve the stability problem of organic photovoltaic devices since the active layer has only a single component and there is no self-aggregation problem.Currently,the efficiency of single component organic solar cells still lags that of double component organic solar cells,so it is imperative to develop more efficient active layer materials for single component organic solar cells.In this paper,a series of double-cable conjugated polymers have been designed and synthesized to seek opportunities for improving the efficiency of single rent organic solar cells through fine regulation of the molecular structure.The main work is as follows:1:We have designed and synthesized a series of conjugated polymers P06-P16 with different lengths linkage units with using PCl BDB-T as a conjugated donor skeleton and NDI molecules as acceptor units.It has been found that the crystalline properties of the polymers change with the chain length,which affects the donor and acceptor phase separation scale,which is also reflected in the carrier mobility and energy conversion efficiency of SCOSCs.It was found that when using decyl(C₁₀H₂₀)and dodecyl(C₁₂H₂₄)linking chains to the recipient,the double-cable polymers P10 and P12 exhibit optimal PCE of 7.70%and 7.68%,respectively.This provides a new perspective for the structural design and phase separation regulation of double-cable conjugated polymers.2:We have designed and synthesized a series of conjugated polymers HP12-HP14 with different lengths of alkyl linkage chain with using PM7 as a conjugated donor skeleton and no fused non-fullerene acceptor as side chain.Due to the strong electron pulling ability of halogen atoms,which reduces molecular energy levels,and the interaction between halogen atoms and other atoms of the molecule can affect intermolecular accumulation and crystallization,HP series polymers exhibit different band gaps and crystallization properties.The study found that the double-cable polymer HP12 containing 4F atoms in the acceptor fragment exhibited 10.18%of the best PCE.This work provides a new idea for designing high efficiency single component organic solar cells.