Perovskite solar cells have recently revolutionized the field of the emerging photovoltaic technologies. They have shown an impressive evolution in the last ten years, jumping from an initial 3.8%1 to a 22.1%2 certified efficiency but still have drawbacks to overcome, some of which are related to the use of the expensive Spiro-OMeTAD as hole transport material (HTM). Phthalocyanines are macrocyclic aromatic compounds that possess excellent p-type semiconducting properties that make them appealing materials as hole transporters, and have recently scored cell efficiencies up to 17.5%3 in perovskite-based devices. With the aim of obtaining an easily processable molecular material minimizing its synthetic pathway and optimizing its HOMO-LUMO values, we have synthesized a symmetrical tetra-n(butoxy)zinc phthalocyanine ((n-BuO)4ZnPc) in one synthetic step. The molecule can be solution-processed to form an effective and inexpensive hole-transport layer for perovskite solar cells. These appealing features are suggested by the results of a series of chemical, optical and voltammetric characterizations of the molecule, supported by the results of ab initio simulations. Preliminary measurements of (n-BuO)4ZnPc-methylammonium lead triiodide perovskite-based devices confirm such suggestion and indicate that the interface between the photoactive layer and the hole transporting layer is characterized by hole-extracting and electron-blocking properties, potentially competitive with those of other standards de facto in the field of organic hole-transport materials. References: 1. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. J. Am. Chem. Soc. 2009, 131(17), 6050-6051 2.Yang, W. S.; Park, B.-W-; Jung, E. H.; Jeon, N. J.; Kim, Y. C.; Lee, D. U.; Shin, S. S.; Seo, J.; Kim, E. K.; Noh, J. H.; Seok, S. I. Science, 2017, 356, 1376-1379. 3.Cho, K. T.; Trukhina, O.; Roldán-Carmona, C.; Ince, M.; Gratia, P.; Grancini, G.; Gao, P.; Marszalek, T.; Pisula, W.; Reddy, P. Y.; Torres, T.; Nazeeruddin, M. K. Adv. Energy Mater. 2017, 1601733.
A solution-processed tetra-alkoxylated zinc phthalocyanine as hole transporting material for perovskite solar cells
Gloria Zanotti;Giuseppe Mattioli;Anna Maria Paoletti;Giovanna Pennesi;Daniela Caschera;
2018
Abstract
Perovskite solar cells have recently revolutionized the field of the emerging photovoltaic technologies. They have shown an impressive evolution in the last ten years, jumping from an initial 3.8%1 to a 22.1%2 certified efficiency but still have drawbacks to overcome, some of which are related to the use of the expensive Spiro-OMeTAD as hole transport material (HTM). Phthalocyanines are macrocyclic aromatic compounds that possess excellent p-type semiconducting properties that make them appealing materials as hole transporters, and have recently scored cell efficiencies up to 17.5%3 in perovskite-based devices. With the aim of obtaining an easily processable molecular material minimizing its synthetic pathway and optimizing its HOMO-LUMO values, we have synthesized a symmetrical tetra-n(butoxy)zinc phthalocyanine ((n-BuO)4ZnPc) in one synthetic step. The molecule can be solution-processed to form an effective and inexpensive hole-transport layer for perovskite solar cells. These appealing features are suggested by the results of a series of chemical, optical and voltammetric characterizations of the molecule, supported by the results of ab initio simulations. Preliminary measurements of (n-BuO)4ZnPc-methylammonium lead triiodide perovskite-based devices confirm such suggestion and indicate that the interface between the photoactive layer and the hole transporting layer is characterized by hole-extracting and electron-blocking properties, potentially competitive with those of other standards de facto in the field of organic hole-transport materials. References: 1. Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. J. Am. Chem. Soc. 2009, 131(17), 6050-6051 2.Yang, W. S.; Park, B.-W-; Jung, E. H.; Jeon, N. J.; Kim, Y. C.; Lee, D. U.; Shin, S. S.; Seo, J.; Kim, E. K.; Noh, J. H.; Seok, S. I. Science, 2017, 356, 1376-1379. 3.Cho, K. T.; Trukhina, O.; Roldán-Carmona, C.; Ince, M.; Gratia, P.; Grancini, G.; Gao, P.; Marszalek, T.; Pisula, W.; Reddy, P. Y.; Torres, T.; Nazeeruddin, M. K. Adv. Energy Mater. 2017, 1601733.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
