Emissive Nanoclusters Based on Subnanometer-Sized Au38 Cores for Boosting the Performance of Inverted Organic Photovoltaic Cells
Emissive Nanoclusters Based on Subnanometer-Sized Au38 Cores for Boosting the Performance of Inverted Organic Photovoltaic Cells
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DOI：
10.1002/aenm.201500393
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发表时间：
2015-07-08
影响因子：
27.8
通讯作者：
Cho, Shinuk
中科院分区：
文献类型：
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作者：
Lim, Dong Chan;Seo, Bo Yeol;Cho, Shinuk
尽管表面等离子体共振(SPR)成功地提高了有机异质结(BHJ)太阳电池的功率转换效率(PCE)，但由于担心可能传递非辐射能量和干扰界面形态，几十个纳米(25-50 nm)金属纳米粒子(NPs)的掺入在进一步提高PCE方面存在一定的局限性。这里，在倒置的BHJ太阳能电池上加入了具有亚纳米尺寸的Au38核心的十二硫醇稳定的Au纳米团簇(Au：SR，R=硫代尾巴)，而不是数十个纳米级的金属纳米粒子。尽管尺寸小于5 nm的金属纳米粒子没有表现出SPR效应对入射光的任何散射或电场增强，但发射Au：SR纳米团簇的加入提供了与数十个纳米级等离子体金属纳米粒子非常相似的效果。由于有效的能量传递，基于Au：SR的原生等离子体荧光，使用Au：SR团簇制备的最高性能太阳能电池的PCE为9.15%；这一值表明与没有Au：SR纳米团簇的太阳能电池相比，效率提高了近20%。
In spite of the successful enhancement of the power-conversion efficiency (PCE) in organic bulk heterojunction (BHJ) solar cells by surface plasmon resonance (SPR), the incorporation of several tens of nanometer-sized (25-50 nm) metal nanoparticles (NPs) has some limitations to further enhancing the PCE due to concerns related to possibly transferring non-radiative energy and disturbing the interface morphology. Instead of tens of nanometer-sized metal NPs, here, dodecanethiol stabilized Au nanoclusters (Au:SR, R = the tail of thiolate) with sub-nm-sized Au38 cores are incorporated on inverted BHJ solar cells. Although metal NPs less than 5 nm in size do not show any scattering or electric field enhancement of incident light by SPR effects, the incorporation of emissive Au:SR nanoclusters provides effects that are quite similar to those of tens of nanometersized plasmonic metal NPs. Due to effective energy transfer, based on the protoplasmonic fluorescence of Au:SR, the highest performing solar cells fabricated with Au:SR clusters yield a PCE of 9.15%; this value represents an approximate to 20% increase in the efficiency compared to solar cells without Au:SR nanoclusters.