Alternative Title有機太陽電池高性能化のためのプラズモニック金ナノ構造の検討
Note (General)Organic solar cells (OSCs) are particularly promising candidates for next-generation renewable power sources. Although the OSCs provide excellent power conversion efficiency (PCE), a short carrier diffusion length limits the photoactive layer thickness, resulting in a low light absorption and efficiency in the devices. Light management plays an important role for light harvesting enhancement in OSCs. The utilization of advanced nanomaterials and the design of device structures for broadening light absorption have gained attraction in order to achieve great photovoltaic performances in OSCs. Additionally, plasmonic nanostructures have been extensively used to increase light trapping and broaden optical absorption in photovoltaic devices. In this study, gold nanoparticles (AuNPs) with different sizes and shapes, consisting of gold quantum dots (AuQDs), gold nanospheres (AuNSs), and gold nanorods (AuNRs) were included within the devices to improve the photovoltaic performances and the synergistic effects from the combination of plasmonic nanostructures (AuQDs/AuNPs, AuQDs/metallic grating, and AuNSs:AuNRs/metallic grating) on the OSCs performances were also investigated. Three work chapters are demonstrated. Firstly, the incorporation of AuQDs and plasmonic AuNPs for OSCs enhancement is described. An important challenge in this part is to apply AuQDs to organic light harvesting systems. AuQDs absorb the UV light and generate visible light as fluorescence emission while AuNPs provide the localized surface plasmon resonance effect. The combination of AuQDs and AuNPs into the OSCs system can enhance the photovoltaic performances due to the absorption of the fluorescence from the AuQDs and energy/electron transfer from the AuQDs to the AuNPs, leading to a 13% improvement in the PCE. Secondly, an enhancement of OSCs performances by incorporating AuQDs together with metallic grating nanostructure is demonstrated. Extending absorption in UV regions by AuQDs is proposed and the fluorescence originated from AuQDs could act as additional light source, enhancing a high photocurrent in the developed device. Moreover, grating-coupled surface plasmon resonance (GCSPR) can increase the optical absorption path length of the devices. Interestingly, the synergistic effect of AuQDs and GCSPR in the developed OSCs exhibited better electrical and optical properties, leading to an enhancement of photocurrent with PCE improvement of approximately 20%. Finally, effect of AuNSs/AuNRs hybrid with metallic grating nanostructure for OSCs enhancement is investigated. The synergistic effect of the multi-LSPR and GCSPR is expected to enhance the optical path length within the devices. AuNSs/AuNRs hybrid were added in a hole transport layer. As compared to reference cell, the developed OSCs exhibited higher photovoltaic performances by increasing both of short-circuit current density (J_<sc>) and PCE with large enhancements of ca. 16.23% and 14.06%, respectively. The results suggest that the incorporation of metallic nanostructures inside the developed photovoltaic devices can improve the OSCs efficiency by increasing broadband absorption and improving electrical property. Therefore, the proposed OSCs could be further developed in practical application.
新大院博(工)甲第496号
開始ページ : 1
終了ページ : 122
Collection (particular)国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
Date Accepted (W3CDTF)2020-08-11T22:41:34+09:00
Data Provider (Database)国立国会図書館 : 国立国会図書館デジタルコレクション