Combination of Molecular, Morphological, and Interfacial Engineering to Achieve Highly Efficient and Stable Plastic Solar Cells

Abstract

A flexible solar device showing exceptional air and mechanical stability is produced by simultaneously optimizing molecular structure, active layer morphology, and interface characteristics. The PFDCTBT-C8-based devices with inverted architecture exhibited excellent power conversion efficiencies of 7.0% and 6.0% on glass and flexible substrates, respectively.

Side-chain modulation of dithienofluorene-based copolymers to achieve high field-effect mobilities

“…10 Embedding a fluorene unit into a highly rigid and coplanar ladder-type conjugated framework would be a promising molecular design. 11 To this end, we recently designed and synthesized a fluorene-based dithieno[3,2- b :6,7- b ′]fluorene (DTF) in which the central fluorene is π-extended by fusing with two outer thiophene rings at its 2,3- and 6,7-junctions. 12 Structurally analogous to IDT, the pentacyclic DTF exhibits high coplanarity and rigidity which reduces the energetic disorder of the backbone and thus enhances 1-dimensional intramolecular charge transport.…”

Recent Advances in P-Type Conjugated Polymers for High-Performance Solar Cells

“…In a similar manner, FDCT structure in P81 was also modified by replacing the branch ethylhexoxyphenyl groups with more flexible octyl groups to afford P84 in order to tune the intermolecular interaction for enhanced absorption intensity, reduced optical band gap, and improved charge mobility [123]. The absorption maxima of P84, substituted with flexible octyl side chains, red-shifted by ca.…”

Comparison of selenophene and thienothiophene incorporation into pentacyclic lactam-based conjugated polymers for organic solar cells

“…Some of these stand out due to their favorable material properties, particularly diketopyrrolopyrrole 8,9 or perylene diimide 10 , and polymers containing large fused backbone moieties, e.g. various indacenodithiophene derivatives [11][12][13][14] or other large extended fused systems [15][16][17][18][19] . Their molecular design promotes inter-chain stacking via polar groups and/or -interactions resulting in improved solid-state order that enables efficient charge separation and transport.…”

“…Additionally, this design allows for deposition of thick active layers which is essential for large-area processing and also improves phase purity, which potentially reduces recombination. 17,18 Furthermore, extended fused moieties in the polymer backbone may improve charge separation. 20 This allows for a minimal LUMOpolymer -LUMOPCBM offset that ensures a high open-circuit voltage (Voc) and also a high short-circuit current density (Jsc) due the smaller bandgap and thus a wider absorption spectrum.…”