Perovskite solar cells: A new paradigm in Energy sector
Mohammad Nazeeruddin a
NIPHO
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Hendrik Bolink and David Cahen
Invited Speaker, Mohammad Nazeeruddin, presentation 025
Publication date: 18th December 2016

Perovskite solar cells: A new paradigm in Energy sector

G. Grancini, C. Roldán-Carmona, I. Zimmermann and M. K. Nazeeruddin

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Ecole polytechnique fédérale de Lausanne, CH-1951 Sion, Switzerland.

mdkhaja.nazeeruddin@epfl.ch 

ABSTRACT: Organo-metal trihalide perovskites have revolutionized the field of thin film solar cells due to their meteoric rise of power conversion efficiency (PCE) of a record value over 22%.1 The advantage of perovskite material is low-cost precursors, and capable of being processed a variety of scalable methods.2-3 Despite impressive photovoltaic performances of perovskite solar cells, most reported devices are not stable under operation. Here we report stable perovskite solar cells by engineering an ultra-stable 2D/3D HOOC(CH2)2NH3)2PbI4/CH3NH3PbI3 perovskite junction. The 2D/3D perovskite films are produced in a single step from the solution containing a mixture of 3% HOOC(CH2)2NH3I, methylammonium iodide and PbI2. The composite mixture self-assembles into gradually organized multidimensional structure that yields up to 14.6% employing mesoporous TiO2 and spiro-MeOTAD as electron and hole specific contacts, respectively. The XRD and photoluminescence analysis demonstrate the unique role of the 2D perovskite, anchored at the interface with the oxide nanoparticle network, in templating and stabilizing the 3D CH3NH3PbI3 phase. The resulting 2D/3D metal halide perovskite solar cells in a hole-conductor free architecture exhibit a record stability under AM 1.5 sunlight. Also, we address hysteresis by using molecularly engineered novel hole transporting materials.4 

References

(1). www.nrel.gov/ncpv/images/efficiency_chart.jpg.

(2). Lee, M. M., Teuscher, J., Miyasaka, T., Murakami, T. N. & Snaith, H. J. Science 338, 643−647 (2012).(3). Burschka, J., Pellet, N., Moon, S-J., Humphry-Baker, R., Gao, P., Nazeeruddin &Grätzel, M, Nature 499, 316−319 (2013).(4). A molecularly engineered hole-transporting material for efficient perovskite solar cells, Michael Saliba & Mohammad Khaja Nazeeruddin, Nature Energy 1, Article number: 15017 (2016), doi:10.1038/nenergy.2015.17

(3). Burschka, J., Pellet, N., Moon, S-J., Humphry-Baker, R., Gao, P., Nazeeruddin &Grätzel, M, Nature 499, 316−319 (2013).

(4). A molecularly engineered hole-transporting material for efficient perovskite solar cells, Michael Saliba & Mohammad Khaja Nazeeruddin, Nature Energy 1, Article number: 15017 (2016), doi:10.1038/nenergy.2015.17



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