Hou Chunli, Huang Chengwen, Yu Huangzhong, Shi Shengwei
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, China.
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
Small. 2022 May;18(21):e2201046. doi: 10.1002/smll.202201046. Epub 2022 Apr 21.
Ti C T , as a newly investigated 2D material, has gained great attention owing to its metallic conductivity, tunable work function (W ), and unique electrical property. However, its W can be further adjusted to meet the needs of optoelectronic devices. Here, surface-engineered Ti C T is fabricated with tunable W by treating with ethanolamine and rhodium chloride (RhCl ). Ethanolamine treated Ti C T can induce the chemical adsorption of NH on Ti C T with hydrogen-bonding, which causes the decreased W , while chemical doping with RhCl leads to the improvement of W , which is achieved by the downshift of Femi level of Ti C T . Moreover, the ethanolamine and RhCl can effectively passivate the vacancies of Ti. As such, the surface-engineered Ti C T is more suitable as buffer layer for polymer solar cells (PSCs) by enhancing the interfacing characteristics of the Ti C T /active layer. The PSCs with engineered Ti C T for electron or hole transport layers can exhibit a power conversion efficiency of 15.88% or 15.54%. These efficiencies can be compared with those of devices with a conventional transport layer. This work provides a facile strategy to realize the work function tunability of Ti C T , and also shows that the tuned Ti C T has a certain application prospect in photovoltaic devices.
Ti C T作为一种新研究的二维材料，因其金属导电性、可调节的功函数（W）和独特的电学性质而备受关注。然而，其功函数可进一步调整以满足光电器件的需求。在此，通过用乙醇胺和氯化铑（RhCl）处理制备了具有可调功函数的表面工程化Ti C T。乙醇胺处理的Ti C T可通过氢键诱导NH在Ti C T上的化学吸附，这导致功函数降低，而用RhCl进行化学掺杂则导致功函数提高，这是通过Ti C T费米能级的下移实现的。此外，乙醇胺和RhCl可有效钝化Ti的空位。因此，表面工程化的Ti C T通过增强Ti C T/活性层的界面特性更适合作为聚合物太阳能电池（PSC）的缓冲层。具有工程化Ti C T用于电子或空穴传输层的PSC可表现出15.88%或15.54%的功率转换效率。这些效率可与具有传统传输层的器件的效率相比较。这项工作提供了一种实现Ti C T功函数可调性的简便策略，并且还表明调谐后的Ti C T在光电器件中具有一定的应用前景。
