Seihou Jinnai

In organic photovoltaics (OPVs) using nonfullerene acceptors, the fine-tuning of interfaces between donor and acceptor in the bulk-heterojunction (BHJ) structure has become an important factor to improve the performance. A series of electron-accepting π-conjugated compounds based on benzothiadiazole and arenedicarboximides were systematically synthesized to investigate the impact of structural modification on molecular orientation at donor–acceptor interfaces. X-ray diffraction and surface free

We revealed the relationship between the London dispersion components of three-dimensional non-fullerene acceptors and photocurrent generation efficiency in bulk-heterojunction-type organic photovoltaics.

Non-fused electron-accepting π-conjugated compounds have been investigated recently for application to nonfullerene acceptors (NFAs) in organic solar cells (OSCs).

Exciton binding energy (E_b) 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_b in the solid state continues to lag behind. Here, to investigate the relationship between aggregation and E_b, star-shaped π-conjugated compounds DBC-RD and TPE-RD we

Abstract 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 b ) 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 (nam

Fine-tuning physical properties by structural modification is important for developing organic semiconducting materials. In this work, we designed and synthesized new electron-accepting compounds containing naphtho[1,2-c:7,8-c']bis([1,2,5]thiadiazole (vNTz) or naphtho[1,2-c:5,6-c']bis[1,2,5]thiadiazole (NTz) groups as electron-accepting units; these units are structural isomers. The vNTz-based compounds have an arch-shaped molecular backbone with C2v symmetry, whereas the NTz-based compound form

Abstract 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 b ) 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 (nam

Organic solar cells (OSCs) have been anticipated as a promising renewable energy source. In particular, green-light wavelength-selective (GLWS) OSCs have the potential to convert green light into electricity while allowing blue and red light to support crop growth, making them suitable for greenhouse integration. To realize GLWS OSCs, P3HT has been selected as a suitable GLWS donor. However, compatible GLWS nonfullerene acceptors (NFAs) compatible for P3HT remain limited. Here, we designed and s

The Photopolymer Science and Technology Award No. 222100, the Best Paper Award 2021, was presented to Seihou Jinnai and Yutaka Ie (The Institute of Scientific and Industrial Research (SANKEN), Osaka University) for their outstanding contribution published in Journal of Photopolymer Science and Technology, 34, (2021) 285-290, entitled “Synthesis, Properties, and Photovoltaic Characteristics of Arch- and S-shaped Naphthobisthiadiazole-based Acceptors”.