Ye Tao, Jiang Xi, Wan Dongyang, Wang Xingzhi, Xing Jun, Venkatesan Thirumalai, Xiong Qihua, Ramakrishna Seeram
Department of Mechanical Engineering and Centre for Nanofibers and Nanotechnology, National University of Singapore, Singapore, 117576, Singapore.
Division of Physics and Applied Physics, Nanyang Technological University, Singapore, 637371, Singapore.
Chemphyschem. 2016 Dec 15;17(24):4102-4109. doi: 10.1002/cphc.201600817. Epub 2016 Nov 7.
Aligned and flexible electrospun carbon nanomaterials are used to synthesize carbon/perovskite nanocomposites. The free-electron diffusion length in the CH NH PbI phase of the CH NH PbI /carbon nanocomposite is almost twice that of bare CH NH PbI , and nearly 95 % of the photogenerated free holes can be injected from the CH NH PbI phase into the carbon nanomaterial. The exciton binding energy of the composite is estimated to be 23 meV by utilizing temperature-dependent optical absorption spectroscopy. The calculated free carriers increase with increasing total photoexcitation density, and this broadens the potential of this material for a broad range of optoelectronics applications. A metal-electrode-free perovskite solar cell (power conversion efficiency: 13.0 %) is fabricated with this perovskite/carbon composite, which shows great potential for the fabrication of efficient, large-scale, low-cost, and metal-electrode-free perovskite solar cells.
取向且柔韧的电纺碳纳米材料被用于合成碳/钙钛矿纳米复合材料。在CH₃NH₃PbI₃/碳纳米复合材料的CH₃NH₃PbI₃相中，自由电子扩散长度几乎是纯CH₃NH₃PbI₃的两倍，并且近95%的光生自由空穴能够从CH₃NH₃PbI₃相注入到碳纳米材料中。利用温度依赖型光吸收光谱法估计该复合材料的激子结合能为23毫电子伏特。计算得到的自由载流子随着总光激发密度的增加而增加，这拓宽了这种材料在广泛的光电子应用中的潜力。用这种钙钛矿/碳复合材料制备了无金属电极的钙钛矿太阳能电池（功率转换效率：13.0%），这显示出在制备高效、大规模、低成本且无金属电极的钙钛矿太阳能电池方面具有巨大潜力。
