Nonfullerene Acceptors Bearing Spiro-Substituted Bithiophene Units in Organic Solar Cells: Tuning the Frontier Molecular Orbital Distribution to Reduce Exciton Binding Energy.

The development of nonfullerene acceptors (NFAs), represented by ITIC, has contributed to improving the power conversion efficiency (PCE) of organic solar cells (OSCs). Although tuning the electronic structures to reduce the exciton binding energy (E) is considered to promote photocharge generation, a rational molecular design for NFAs has not been established. In this study, we designed and developed two ITIC-based NFAs bearing spiro-substituted bithiophene or biphenyl units (named SpiroT-DCI and SpiroF-DCI) to tune the frontier molecular orbital (FMO) distribution of NFAs.

A Dibenzo[g,p]chrysene-Based Organic Semiconductor with Small Exciton Binding Energy via Molecular Aggregation.

Exciton binding energy (E) is understood as the energy required to dissociate an exciton in free-charge carriers, and is known to be an important parameter in determining the performance of organic opto-electronic devices. However, the development of a molecular design to achieve a small level of E in the solid state continues to lag behind. Here, to investigate the relationship between aggregation and E, star-shaped π-conjugated compounds DBC-RD and TPE-RD were developed using dibenzo[g,p]chrysene (DBC) and tetraphenylethylene (TPE).

Green-light wavelength-selective organic solar cells for agrivoltaics: dependence of wavelength on photosynthetic rate.

There is a growing demand for the development of novel solar power systems that can simultaneously solve the problems associated with both energy generation and food supply in agriculture. Green-light wavelength-selective organic solar cells (OSCs), whose transmitted blue and red light can be utilized to promote plant growth were recently reported by our group. However, the influence of wavelength variation on the photosynthetic rate in green-light wavelength-selective OSCs remains unclear.

Correction: Phosphaacene as a structural analogue of thienoacenes for organic semiconductors.

Correction for 'Phosphaacene as a structural analogue of thienoacenes for organic semiconductors' by Kyohei Matsuo , , 2022, , 13576-13579, https://doi.org/10.1039/D2CC05122B.

Phosphaacene as a structural analogue of thienoacenes for organic semiconductors.

An air-stable λ-phosphinine-containing polycyclic aromatic compound without steric protection was synthesized and its charge transport properties were evaluated, which revealed moderate hole mobility. This research is the first experimental demonstration of the organic electronic applications of low-coordinate phosphorus compounds.

Quinoidal Oligothiophenes Having Full Benzene Annelation: Synthesis, Properties, Structures, and Acceptor Application in Organic Photovoltaics.

To achieve a complete closed-shell quinoidal state, bis(dicyanomethylene)-substituted quinoidal terthiophenes bearing benzene annelation at all thiophene rings were synthesized using a retro-Diels-Alder reaction as the key step. The unique structures and properties originating from the full benzene annelation were revealed by X-ray analysis as well as property measurements. Organic solar cells based on the combination of a donor polymer with a quinoidal terthiophene as an acceptor showed a power conversion efficiency of 1.

Electron-donor function of methanofullerenes in donor-acceptor bulk heterojunction systems.

Electron-donor function of methanofullerenes (MFs) in bulk heterojunction systems is demonstrated by the combination of MFs with the electron-transporting π-system that has a much higher electron affinity than MFs.

Three-dimensional electron-accepting compounds containing perylene bis(dicarboximide)s as n-type organic photovoltaic materials.

The synthesis of three-dimensional compounds containing perylene bis(dicarboximide) for application as acceptor materials in organic photovoltaics is reported. Physicochemical measurements as well as device evaluations revealed that the characteristic properties of these materials are derived from their three-dimensional structure.