P3HT/Phthalocyanine Nanocomposites as Efficient Hole‐Transporting Materials for Perovskite Solar Cells

• Published in: Solar RRL 2019-01, Vol.3 (1), p.n/a
• Main Authors: Hu, Qikun, Rezaee, Ehsan, Dong, Qingshun, Shan, Haiquan, Chen, Qian, Wang, Liduo, Liu, Bingchen, Pan, Jia‐Hong, Xu, Zong‐Xiang
• Format: Article
• Language: English
• Subjects: composite; hole transporting materials; P3HT; perovskite solar cells; phthalocyanine nanowire
• ISSN: 2367-198X; 2367-198X
• DOI: 10.1002/solr.201800264

New efficient hole‐transport material (HTM) composites based on low‐cost easy‐preparation non‐peripheral octamethyl‐substituted copper (II) phthalocyanine (N‐CuMe2Pc) nanowire and poly(3‐hexylthiophene) (P3HT) are developed for CH3NH3PbI3 (MAPbI3)‐based perovskite solar cells (PSCs). Compared with pristine P3HT, the prepared nanocomposite HTMs provided thin films with better qualities and reduced trap densities, and exhibited higher hole mobilities and well‐matched energy levels with the perovskite layer. Depending on the ratio of the two components, the power conversion efficiency (PCE) reached up to 16.61%, which is higher than the efficiency of the standard device based on doped spiro‐OMeTAD (16.13%). Moreover, the long‐term stability of the PSCs is also improving greatly. The best performing devices based on P1C1 HTM retained 90% of their initial efficiencies after 800 h of storage with a relative humidity of 75%. These results indicate N‐CuMe2Pc nanowire/P3HT nanocomposites can be an effective HTM to realize superior performance in PSCs. Non‐peripheral octamethyl‐substituted copper (II) phthalocyanine nanowires are incorporated in poly(3‐hexylthiophene) to form nanocomposite, which exhibited higher hole mobilities and well‐matched energy levels. A power conversion efficiency of 16.61% is achieved for a perovskite solar cell based on composite hole‐transport material which retains 90% of their initial efficiencies after 800 h of storage at 25 °C with a relative humidity of 75% without any encapsulations.