Facile synthesis of a dopant-free hole transporting material with a phenothiazine core for planar perovskite solar cells. Issue 84 (22nd November 2017)

• Record Type: Journal Article
• Authors: Liu, Xiaoyuan; Tan, Xiao; Chen, Qian; Shan, Haiquan; Liu, Changmei; Xu, Jiaju; Chen, Zhi-Kuan; Huang, Wei; Xu, Zong-Xiang
• Is Part Of: RSC advances. Volume 7:Issue 84(2017)
• Page Start: 53604
• Page End: 53610
• Publication Date: 2017-11-22
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra10677g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : PTZ-TPA was incorporated into a CH3 NH3 PbI3 perovskite solar cell as a dopant-free HTM exhibiting a comparable PCE (14.1%) and higher stability compared with that of HTM Spiro-MeOTAD with dopant (17.1%). Abstract : A novel electron-rich small-molecule, 4, 4′-(10-(4-octylphenyl)-10 H -phenothiazine-3, 7-diyl)bis( N, N -(4-methoxyphenyl)anilene) (PTZ-TPA), containing phenothiazine as the core with triphenylamine side groups, was synthesized via a Suzuki–Miyaura cross-coupling reaction. When PTZ-TPA was incorporated into a CH3 NH3 PbI3 perovskite solar cell as a dopant-free hole transporting material (HTM), a short circuit photocurrent density of 21.5 mA cm −2, an open circuit voltage of 0.982 V, and a fill factor of 0.679 were obtained, giving rise to an overall power conversion efficiency of 14.3%, which is comparable to the power conversion efficiency obtained using the current state-of-the-art HTM 2, 20, 7, 70-tetrakis( N, N ′-di- p -methoxyphenylamine)-9, 90-spirobifluorene with dopant (Spiro-MeOTAD, power conversion efficiency of 17.1%). PTZ-TPA is thus a promising HTM with the potential to replace the expensive Spiro-MeOTAD owing to its comparable performance and much simpler synthesis route; it also presented a better stability during a one week aging test compared with Spiro-MeOTAD.