Abstract
The binding of a porphyrin dimer donor (ETDPP-2P) and a non-fullerene acceptor IT-M leads to a visible-near-infrared photoresponse in all small molecule organic solar cells with a power conversion efficiency of 5.69%.
Highlights
A–D–A structural SM acceptors built from fused indacenodithiophene (IDT)[18] rings and their analogues, such as ITIC,[17] IEIC,[19] IT-4F,20 IT-M,21 and IDIC22 (see abbreviations in the Electronic supplementary information (ESI)†), have shown the most promising performance in NF-organic solar cells (OSCs) because of their intensive near-infrared (NIR) absorption, processable capability, well-defined crystallinity, and ideal bandgaps.[8,23,24] SM donors sporadically succeeded with several advantages such as high crystallinity, rapid aggregation pathways, controllable energy levels, etc., and as a result, assisting the significant enhancement of power conversion efficiencies (PCEs) in recent years.[25,26,27,28,29,30,31,32,33,34,35,36,37,38] the combination of a SM donor and a SM acceptor has been a bottleneck hindering the performance so far due to their high crystallinity and unfavourable phase separation and morphologies.[25,39] Recently, Wei et al reported an A–p–D–p–A structural narrow bandgap SM donor based on a larger coplanar core DTBDT and achieved the highest PCE of 14.34% at that time for binary all SM OSCs by optimizing their hierarchical morphologies.[35]
A–D–A structural SM acceptors built from fused indacenodithiophene (IDT)[18] rings and their analogues, such as ITIC,[17] IEIC,[19] IT-4F,20 IT-M,21 and IDIC22, have shown the most promising performance in NF-organic solar cells (OSCs) because of their intensive near-infrared (NIR) absorption, processable capability, well-defined crystallinity, and ideal bandgaps.[8,23,24]
We have designed and synthesized two new porphyrin dimers TDPP-2P and ETDPP-2P constructed from the dimeric porphyrin core linked by TDPP and diethynyl substituted TDPP, respectively
Summary
A–D–A structural SM acceptors built from fused indacenodithiophene (IDT)[18] rings and their analogues, such as ITIC,[17] IEIC,[19] IT-4F,20 IT-M,21 and IDIC22 (see abbreviations in the ESI†), have shown the most promising performance in NF-OSCs because of their intensive near-infrared (NIR) absorption, processable capability, well-defined crystallinity, and ideal bandgaps.[8,23,24] SM donors sporadically succeeded with several advantages such as high crystallinity, rapid aggregation pathways, controllable energy levels, etc., and as a result, assisting the significant enhancement of PCEs in recent years.[25,26,27,28,29,30,31,32,33,34,35,36,37,38] the combination of a SM donor and a SM acceptor has been a bottleneck hindering the performance so far due to their high crystallinity and unfavourable phase separation and morphologies.[25,39] Recently, Wei et al reported an A–p–D–p–A structural narrow bandgap SM donor based on a larger coplanar core DTBDT and achieved the highest PCE of 14.34% at that time for binary all SM OSCs by optimizing their hierarchical morphologies.[35]. Compared with TDPP-2P, ETDPP-2P with ethynylene conjugated DPP exhibits very broad and redshifted (175 nm) Q-band absorption over the NIR region because the elongated p-conjugation enhances the strong intramolecular charge transfer (ICT) interactions within the porphyrin molecules.
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