Meta-analysis: the molecular organization of non-fullerene acceptors

Abstract

The chemical structure of a molecule influences the molecular conformation in the solid-state affecting the crystal packing, which in turn drives the charge carrier transport anisotropy.

Free Charge Photogeneration in a Single Component High Photovoltaic Efficiency Organic Semiconductor

“…Even assuming 100% charge yield, this gives a low effective mass of * = 0.16 , a value below those estimated in various non-fullerene molecules from DFT models. 33 These results are again indicative of intrinsic charge generation, with rapid bimolecular recombination due to high local charge mobilities. 40 We can fit our transient absorption kinetics and intensity-dependent PLQE data based on a basic kinetic model of free charges, charge-transfer states, and singlet excitons present in a neat film of Y6 upon illumination.…”

Towards photovoltaic windows: scalable fabrication of semitransparent modules based on non-fullerene acceptors via laser-patterning

“…In this study, the commercial PBTZT-stat-BDTT-8 (ref. 13 and 42) and 4TICO 44 were selected as electron donor and acceptor materials, respectively, see Fig. 1(a).…”

“…13,41 Despite the good transport properties of these fullerene-based blends, the fullerene acceptors barely contribute to the overall light absorption of the device, thus limiting the light-harvesting capacity of the system, and consequently the device performance. To partially overcome this limitation, we incorporate the newly developed non-fullerene acceptor 4TICO 44 with the same core structure as the reported IHIC, that shows efficiencies over 9% when integrated in solar cells comprising evaporated electrodes. 31 4TICO exhibits a strong absorption in the near-infrared (NIR) region and a weak absorption in the visible range, thus contributing to the transparency of the device ( Fig.…”

Tetrabromination versus Tetrachlorination: A Molecular Terminal Engineering of Nonfluorinated Acceptors to Control Aggregation for Highly Efficient Polymer Solar Cells with Increased Voc and Higher Jsc Simultaneously

“…Polymer solar cells (PSCs) have achieved a huge breakthrough in the past 5 years with the combinational contributions from the developments of nonfullerene acceptors (NFAs), polymeric donors, and kind of redundant of device engineering. [ 1–12 ] Compared with traditional fullerene acceptors, A–D–A framework nonfullerene small molecular acceptors (NF‐SMAs) have significant advantages in broader absorption range, tunable molecular structure and energy levels, and diversified donor materials for matching. [ 13–23 ] Therefore, many such typed NF‐SMAs have been synthesized and become the mainstream materials for the development of high‐efficiency PSCs.…”