Min Chenbo, Chen Yihui, Yang Yonglin, Wu Hongzhao, Guo Bailin, Wu Sirui, Huang Qichuan, Qin Donghuan, Hou Lintao
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Luminescent Materials & Devices, Institute of Polymer Optoelectronic Materials & Devices, South China University of Technology, Guangzhou 510640, China.
Nanomaterials (Basel). 2023 May 30;13(11):1766. doi: 10.3390/nano13111766.
Solution-processed cadmium telluride (CdTe) nanocrystal (NC) solar cells offer the advantages of low cost, low consumption of materials and large-scale production via a roll-to-roll manufacture process. Undecorated CdTe NC solar cells, however, tend to show inferior performance due to the abundant crystal boundaries within the active CdTe NC layer. The introduction of hole transport layer (HTL) is effective for promoting the performance of CdTe NC solar cells. Although high-performance CdTe NC solar cells have been realized by adopting organic HTLs, the contact resistance between active layer and the electrode is still a large problem due to the parasitic resistance of HTLs. Here, we developed a simple phosphine-doping technique via a solution process under ambient conditions using triphenylphosphine (TPP) as a phosphine source. This doping technique effectively promoted the power conversion efficiency (PCE) of devices to 5.41% and enabled the device to have extraordinary stability, showing a superior performance compared with the control device. Characterizations suggested that the introduction of the phosphine dopant led to higher carrier concentration, hole mobility and a longer lifetime of the carriers. Our work presents a new and simple phosphine-doping strategy for further improving the performance of CdTe NC solar cells.
溶液法制备的碲化镉（CdTe）纳米晶（NC）太阳能电池具有成本低、材料消耗少以及可通过卷对卷制造工艺进行大规模生产等优点。然而，未修饰的CdTe NC太阳能电池由于活性CdTe NC层内存在大量晶界，往往表现出较差的性能。引入空穴传输层（HTL）对提高CdTe NC太阳能电池的性能是有效的。尽管通过采用有机HTL实现了高性能的CdTe NC太阳能电池，但由于HTL的寄生电阻，活性层与电极之间的接触电阻仍然是一个大问题。在此，我们在环境条件下通过溶液法开发了一种简单的膦掺杂技术，使用三苯基膦（TPP）作为膦源。这种掺杂技术有效地将器件的功率转换效率（PCE）提高到了5.41%，并使器件具有非凡的稳定性，与对照器件相比表现出优异的性能。表征表明，膦掺杂剂的引入导致了更高的载流子浓度、空穴迁移率以及更长的载流子寿命。我们的工作提出了一种新的简单膦掺杂策略，以进一步提高CdTe NC太阳能电池的性能。
