Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, 1525 Budapest, Hungary.
Nanoscale. 2017 Nov 23;9(45):17781-17787. doi: 10.1039/c7nr06136f.
We have investigated the optical absorption of metallic and semiconducting carbon nanotubes/CHNHPbI micro- and nanowire composites. Upon visible light illumination semiconducting carbon nanotube based samples show a photo-induced doping, originating from the charge carriers created in the perovskite while this kind of change is absent in the composites containing metallic nanotubes, due to their strikingly different electronic structure. The response in the nanotubes shows, beside a fast diffusion of photo-generated charges, a slow component similar to that observed in pristine CHNHPbI attributed to structural rearrangement, and leading to slight, light induced changes of the optical gap of the perovskite. This charge transfer from the illuminated perovskite confirms that carbon nanotubes (especially semiconducting ones) can form efficient charge-transporting layers in the novel organometallic perovskite based optoelectronic devices.
我们研究了金属和半导体碳纳米管/CHNHPbI 微纳线复合材料的光学吸收。在可见光照射下，基于半导体碳纳米管的样品显示出光致掺杂，这源于钙钛矿中产生的载流子，而在含有金属纳米管的复合材料中则没有这种变化，因为它们的电子结构截然不同。在纳米管中的响应除了光生电荷的快速扩散外，还显示出类似于在原始 CHNHPbI 中观察到的缓慢成分，这归因于结构重排，并导致钙钛矿光学带隙的轻微、光诱导变化。这种来自被照亮的钙钛矿的电荷转移证实了碳纳米管（特别是半导体碳纳米管）可以在新型有机金属钙钛矿基光电设备中形成有效的电荷输运层。
