Plasmon-enhanced optical absorption and photocurrent in organic bulk heterojunction photovoltaic devices using self-assembled layer of silver nanoparticles
Plasmon-enhanced optical absorption and photocurrent in organic bulk heterojunction photovoltaic devices using self-assembled layer of silver nanoparticles
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DOI：
10.1016/j.solmat.2009.08.006
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发表时间：
2010-02
影响因子：
6.9
通讯作者：
W. Yoon;K-Y Jung;Ji-wen Liu;Thirumalai Duraisamy;Rao Revur;F. Teixeira;S. Sengupta;Paul R. Berger
中科院分区：
文献类型：
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作者：
W. Yoon;K-Y Jung;Ji-wen Liu;Thirumalai Duraisamy;Rao Revur;F. Teixeira;S. Sengupta;Paul R. Berger
使用由胶体溶液形成的Ag纳米颗粒的独特自组装单层证明了聚噻吩-富勒烯本体异质结光伏器件的光吸收和光电流的改善。在存在抑制其附聚倾向的合适的纳米颗粒有机封端基团的情况下，可以定制颗粒与颗粒的间距。透射电子显微镜显示自组装的银纳米球是高度均匀的，平均直径为1.4nm，可控的粒子到粒子的间距。局域表面等离子体共振峰位于465 nm处，具有窄的半峰全宽（95 nm）。在有机本体异质结光活性膜吸收的350- 650 nm的光谱范围内，由于Ag纳米球内激发的局部表面等离子体激元在光活性层中增加的电场，观察到增强的光吸收。在短路条件下，诱导光电流效率（IPCE）的测量表明，在500 nm处，具有自组装层的Ag纳米颗粒的实验器件的最大IPCE增加到约51.6%，而在480 nm处，没有等离子体活性Ag纳米颗粒的参考器件的IPCE为约45.7%。对于在大气质量为1.5的全局滤波照明下的实验装置，在入射强度为100 mW/cm 2的情况下，观察到由于银纳米颗粒的等离子体共振附近的激子的光生的增强而增加的短路电流密度。
Improved optical absorption and photocurrent for polythiophene–fullerene bulk heterojunction photovoltaic devices is demonstrated using a unique self-assembled monolayer of Ag nanoparticles formed from a colloidal solution. With the presence of suitable nanoparticle organic capping groups that inhibit its propensity to agglomerate, the particle-to-particle spacing can be tailored. Transmission electron microscopy reveals the self-assembled Ag nanospheres are highly uniform with an average diameter of ∼4nm and controllable particle-to-particle spacing. The localized surface plasmon resonance peak is ∼465nm with a narrow full width at half maximum (95nm). In the spectral range of 350–650nm, where the organic bulk heterojunction photoactive film absorbs, an enhanced optical absorption is observed due to the increased electric field in the photoactive layer by excited localized surface plasmons within the Ag nanospheres. Under the short-circuit condition, the induced photo-current efficiency (IPCE) measurement demonstrates that the maximum IPCE increased to ∼51.6% at 500nm for the experimental devices with the self-assembled layer of Ag nanoparticles, while the IPCE of the reference devices without the plasmon-active Ag nanoparticles is ∼45.7% at 480nm. For the experimental devices under air mass 1.5 global filtered illuminations with incident intensity of 100mW/cm2, the increased short-circuit current density is observed due to the enhancement of the photogeneration of excitons near the plasmon resonance of the Ag nanoparticles.