A novel phenoxazine-based hole transport material for efficient perovskite solar cell

作者：Cheng, Ming; Chen, Cheng; Xu, Bo; Hua, Yong; Zhang, Fuguo; Kloo, Lars; Sun, Licheng^*

来源：Journal of Energy Chemistry, 2015, 24(6): 698-706.

DOI：10.1016/j.jechem.2015.10.021

• Dopant-free
• Perovskite solar cell
• Hole transport material
• Phenoxazine
• Thin film

Based on the previous research work in our laboratory, we have designed and synthesized a small-molecule, hole transport material (HTM) POZ6-2 using phenoxazine (POZ) as central unit and dicyanovinyl units as electron-withdrawing terminal groups. Through the introduction of a 2-ethyl-hexyl bulky chain into the POZ core unit, POZ6-2 exhibits good solubility in organic solvents. In addition, POZ6-2 possesses appropriate energy levels in combination with a high hole mobility and conductivity in its pristine form. Therefore, it can readily be used as a dopant-free HTM in perovskite solar cells (PSCs) and a conversion efficiency of 10.3% was obtained. The conductivity of the POZ6-2 layer can be markedly enhanced via doping in combination with typical additives, such as 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI). Correspondingly, the efficiency of the PSCs was further improved to 12.3% using doping strategies. Under the same conditions, reference devices based on the well-known HTM Spiro-OMeTAD show an efficiency of 12.8%.

• 出版日期2015-11
• 单位大连理工大学; 精细化工国家重点实验室