Publication date: 5th November 2025
Heterojunction interfaces play a critical and dominant role in charge carrier dynamics in various optoelectronic devices, including organic photovoltaics (OPVs), organic photocatalysts, and perovskite solar cells. Here, I will discuss the critical role of these interfaces in the following three topics: 1) the charge generation in single-component organic semiconductor photovoltaics, 2) the formation of long-lived charge carriers in organic semiconductor nanoparticle in aqueous solutions, and 3) the enhancement of open-circuit voltage (VOC) in perovskite solar cells. In the first topic, we will discuss the charge generation in single-component OPVs by evaluating the exciton binding energy of neat films composed of extended π-conjugated molecules, such as Y6, and comparing their charge generation efficiency to blended films to identify the primary charge generation sites. In the second topic, recent studies have shown efficient hydrogen generation by using organic semiconductor blend nanoparticles in aqueous solutions, suggesting that charge carriers would survive for a long time enough to contribute to photocatalytic reaction effectively. We will discuss the origin of this long-lived charge carriers by comparing the charge dynamics of blend thin films measured in nitrogen versus in water. In the third topic, we will discuss the effect of interface modification using self-assembled molecules at the interface of electron-transporting layer/perovskite within n-i-p structure tin-based perovskite solar cells, demonstrating how this interfacial engineering suppresses charge recombination and leads to a significant increase in the open-circuit voltage.
This work was supported by JSPS KAKENHI (Grant Nos. JP21H04692, JP22K19062, JP25K08776), the JST MIRAI projects (Grant No. JPMJMI20E2, JPMJMI22E2), the JST ALCA-Next Program (Grant No. JPMJAN25G1).
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