Recent Progress in Indacenodithiophene-Based Acceptor Materials for Non-Fullerene Organic Solar Cells

Single component white-OLEDs derived from tris(β-diketonato) europium(iii) complexes bearing the large bite angle N^N 2-(4-thiazolyl)benzimidazole ligand

“…This could be attributed to the greater number of fluorine (F) atoms on the ligands in Eu2 which is favourable for inducing increased intramolecular charge transfer (ICT). 19…”

“…This could be attributed to the greater number of fluorine (F) atoms on the ligands in Eu2 which is favourable for inducing increased intramolecular charge transfer (ICT). 19 To rationalize the experimental optical absorption spectroscopy results, we calculated the theoretical absorption spectra by the TD-DFT and INDO/S-CIS methods (Fig. 3b) employing the optimized geometry with the PBE1PBE/ TZVPPD/MWB52 level of theory.…”

Effect of terminal fluorine substitution of a nonfullerene small molecular acceptor on the thermal stability of organic solar cells

“…Excitedly, the PCEs based on single junction OSCs have been more than 18% in recent years. [6][7][8][9] These achievements are mainly attributed to the development of nonfullerene small molecular acceptors (NFSMAs) [10][11][12][13][14][15] and corresponding device engineering. [16][17][18] From ITIC to Y6, many molecular design strategies of NFSMAs have been proposed to adjust the photoelectric properties of NFSMAs, and thus elevated the PCEs of OSCs.…”

Ultrafast Carrier Dynamics of Non-fullerene Acceptors with Different Planarity: Impact of Steric Hindrance

“…Unlike the fullerene derivatives with weak absorption characters, the advanced non-fullerene acceptors can much improve the photovoltaic performance of OSCs because of the intense light absorption in the visible and near-infrared regions. 4,5 Thus far, there are increasingly studies focusing on the working mechanism of non-fullerene-acceptor-based OSCs. 6−12 For example, Zhang et al found biphasic hole transfer behavior with an ultrafast interfacial process (<100 fs) and a major diffusion-mediated hole transfer process until 100 ps.…”

“…In recent years, organic solar cells (OSCs) based on non-fullerene acceptors have made significant progress, and the highest power conversion efficiency (PCE) has reached more than 19%. − In comparison to the tremendous effort on the material innovation, photophysical process research is relatively backward, which will become a restrictive factor hindering the further development of OSCs. Unlike the fullerene derivatives with weak absorption characters, the advanced non-fullerene acceptors can much improve the photovoltaic performance of OSCs because of the intense light absorption in the visible and near-infrared regions. , Thus far, there are increasingly studies focusing on the working mechanism of non-fullerene-acceptor-based OSCs. − For example, Zhang et al found biphasic hole transfer behavior with an ultrafast interfacial process (<100 fs) and a major diffusion-mediated hole transfer process until 100 ps . Wang et al discovered that, in the PM6/Y6 blend, the intramoiety excimer state acts as the intermediate for the hole transfer channel, which dissociates into free polarons on a time scale of 15 ps .…”