Abstract
At present, organic small molecule-based hole transporting materials (HTMs) are extensively investigated in perovskite solar cells (PSCs), and a variety of structures have been developed. Most of the studies in HTMs focus on the central scaffolds, while little attention is paid to the periphery groups. In this work, two small organic molecules (TPE-2Cz and TPE-3Cz) are designed and synthesized, with tetraphenylethylene as the core structure, N-ethylcarbazole and methoxyphenyl as the peripheral groups. The C2 or C3 position on N-ethylcarbazole is connected to the arylamine N atom in TPE-2Cz and TPE-3Cz, respectively. We systematically investigate how the N-ethylcarbazole modified at different positions (C2 or C3) affect the property of HTMs and finally the performance of PSC devices. Compared with TPE-2Cz, TPE-3Cz shows a higher hole mobility, better hole extraction and hole transport ability. The device based on TPE-3Cz as the hole transport material achieves a decent power conversion efficiency of 20.94%. Therefore, our work reveals that the periphery group engineering should be taken into consideration when designing organic HTMs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.