磺酸化CNTs在钙钛矿太阳能电池电极中的应用

Application of sulfonated-CNTs in perovskite solar cells counter electrode

为解决钙钛矿太阳能电池(perovskite solar cells,PSCs)中采用贵金属作为对电极(counter electrode,CE)而导致的成本高昂问题,对碳纳米管(CNTs)进行磺酸化处理,并将磺酸化CNTs(s-CNTs)作为对电极材料应用到PSCs中.利用稳态荧光(PL)、电化学阻抗(EI)等方法对PSCs的电荷传输过程进行研究,结果如下:与CNTs对电极相比,s-CNTs对电极具有更好的导电性、更优异的空穴提取和传输能力,在s-CNTs基PSC上获得6.18%的能量转换效率.当喷涂量为1 mL/块,退火温度为100℃,退火时间为30 min时,s-CNTs基PSC的各项性能最优,并具有较好的重复性.研究结果为改善碳基PSCs的光电性能提供了新思路.

In order to solve the high cost problem caused by using noble metals as counter electrodes(CE)in perovskite solar cells(PSCs),carbon nanotubes(CNTs)were sulfonated,and the sulfonated-CNTs(s-CNTs)were used as counter electrode materials in PSCs.The charge transfer process of PSCs was studied by using steady state fluorescence(PL)and electrochemical impedance(EI).The results show that compared with the CNTs counter electrode,the s-CNTs counter electrode has better conductivity,better hole extraction and transport ability,and the energy conversion efficiency of 6.18%is obtained on the s-CNTs based PSC.For the spraying amount 1 mL/block,the annealing temperature 100℃and the annealing time 30 min,the performance of s-CNTs based PSC is the best and has a good repeatability.The results can provide a new way to improve the photoelectric properties of carbon based PSCs.