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Prof. Nazeeruddin - New Horizons for photovoltaics: Perovskite solar cells

Perovskite solar cells have created enormous excitement among the photovoltaic community after the seminal work of Miyasaka and co-workers1 and followed by solid-state perovskite solar cells.2-3 Several groups have demonstrated that the Methylammonium lead triiodide perovskite (CH3NH3PbI3) have remarkable properties such as panchromatic absorption with large molar extinction coefficient, long carrier diffusion length with low non-radiative recombination rates, and an electron and hole transporter in both mesoscopic networks and planar heterojunctions. The band gap of the CH3NH3PbI3 perovskite absorber layer can be tuned by using various cations and anions, and deposited using a broad range of techniques. There are several perovskite solar cell device architectures, but the highest reported efficiency over 20% is based on n-i-p structure, where the perovskite is an intrinsic semiconductor, TiO2 as an electron acceptor (n-type layer), and polytertiary aryl amine polymer (PTAA) or 2,2’,7,7’-tetrakis(N,N-di-p-methoxyphenylamine)-9,9’-spirobifluorene as hole transporter (p-type layer) yielding power conversion efficiency of 20%.4 Nevertheless, these HTM’s are relatively expensive and limits the long-term stability of the perovskite solar cell device under light and heat soaking conditions. Therefore several groups have developed novel hole transporting materials based on molecularly engineered organic,5-6 and inorganic,7 which yields comparable power conversion efficiency of state-of-the-art HTM’s under AM 1.5 conditions.

References

  • A. Kojima, K. Teshima, Y. Shirai, T. Miyasaka, J. Am. Chem. Soc. 2009, 131, 6050.

  • H.-S. Kim, C.-R. Lee, J.-H. Im, K.-B. Lee, T. Moehl, A. Marchioro, S.-J. Moon, R. Humphry-Baker, J.-H. Yum, J. E. Moser, M. Grätzel, N.-G. Park, Scientific Reports 2012, 2, 591.

  • M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami, H. J. Snaith, Science 2012, 338, 643.

  • N. J. Jeon, J. H. Noh, W. S. Yang, Y. C. Kim, S. Ryu, J. Seo, S. I. Seok, Nature 2015, 517, 476.

  • G. Peng, K. Domanski, A. Sadig, M. K. Nazeeruddin, Chimia 2015, 69, 253.

  • H. Li, K. Fu, A. Hagfeldt, M. Grätzel, S. G. Mhaisalkar, A. C. Grimsdale, Angew. Chem. Int. Ed. 2014, 53, 4085.

  • P. Qin, S. Tanaka, S. Ito, N. Tetreault, K. Manabe, H. Nishino, M. K. Nazeeruddin, M. Grätzel, Nature Commun. 2014, 5, 3834.

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