Mohan Minu, Sekar Ramkumar, Namboothiry Manoj A G
School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) Maruthamala P O, Vithura Thiruvananthapuram Kerala 695551 India
RSC Adv. 2020 Jul 10;10(44):26126-26132. doi: 10.1039/d0ra04076b. eCollection 2020 Jul 9.
Truncated octahedral gold (Au) nanoparticles (NPs), Au nanocubes (NCs)-, and silver (Ag) NCs are used to study the effect of NPs shape, material and incorporation location on the performance of poly(3-hexylthiophene):[6,6]-phenyl-C-butyric acid methyl ester (P3HT:PCBM) based inverted bulk heterojunction (BHJ) organic solar cells (OSCs). Plasmonic OSCs (POSCs) with NPs incorporated as an interfacial layer between zinc oxide (ZnO) and active layer showed highest power conversion efficiency (PCE) and short circuit current density ( ) values for all kind of shapes and material compared to POSCs with NPs blended into the active layer. Near-field enhancement as well as enhanced forward scattering cross section is attributed for POSC performance improvement. Among the NPs with two shapes, POSCs with truncated octahedral Au NPs exceeded the photovoltaic performance compared to those of POSCs with Au and Ag NCs. Large number of antennas in truncated octahedral Au NPs compared to NC is reasoned to be the cause for this improvement. Even though Ag has better localised surface plasmon resoanance (LSPR) properties compared to Au, the POSCs with Ag NCs showed lower value and is due to reduced number of photons at the blue shifted LSPR wavelength of Ag NCs. The improvement in values of POSCs is confirmed by enhancement in absorption, external quantum efficiency (EQE), exciton generation and exciton dissociation probability measurements and is due to improved LSPR coupling of the NPs with the active layer. The surface enhanced Raman scattering (SERS) and photoluminescence (PL) studies confirm the absorption enhancement in the active layer by NP LSPR coupling and further confirm the enhancement in the photovoltaic performance of POSCs.
截顶八面体金（Au）纳米颗粒（NPs）、金纳米立方体（NCs）和银（Ag）纳米立方体用于研究纳米颗粒的形状、材料以及掺入位置对基于聚（3-己基噻吩）：[6,6]-苯基-C-丁酸甲酯（P3HT:PCBM）的倒置体异质结（BHJ）有机太阳能电池（OSCs）性能的影响。与纳米颗粒掺入活性层的等离子体有机太阳能电池（POSCs）相比，纳米颗粒作为界面层掺入氧化锌（ZnO）和活性层之间的等离子体有机太阳能电池在所有形状和材料中表现出最高的功率转换效率（PCE）和短路电流密度（ ）值。近场增强以及向前散射截面的增强归因于POSC性能的提高。在两种形状的纳米颗粒中，与具有金和银纳米立方体的POSCs相比，具有截顶八面体金纳米颗粒的POSCs的光伏性能更优。与纳米立方体相比，截顶八面体金纳米颗粒中大量的天线被认为是性能提高的原因。尽管与金相比，银具有更好的局域表面等离子体共振（LSPR）特性，但具有银纳米立方体的POSCs的 值较低，这是由于银纳米立方体蓝移的LSPR波长处光子数量减少所致。通过吸收增强、外量子效率（EQE）、激子产生和激子解离概率测量证实了POSCs的 值的提高，这归因于纳米颗粒与活性层之间改善的LSPR耦合。表面增强拉曼散射（SERS）和光致发光（PL）研究证实了通过纳米颗粒LSPR耦合活性层中的吸收增强，并进一步证实了POSCs光伏性能的增强。
