Lower dimensionality and lead-free perovskites: alternatives to CH3NH3PbI3 for photovoltaic and light emission applications

Pablo P. Boix^a, Subodh G. Mhaisalkar^a, Nripan Mathews^a, Timothy White^b, Tze Chien Sum^c

^aEnergy Research Institute @ NTU (ERI@N), Research Technoplaza, Nanyang Technological University, Singapore, Nanyang Drive, Singapore, Singapore

^bMSE, Nanyang Technological University, Nanyang Avenue, Singapore 639798

^cSPMS, Nanyang Technological University, 21 Nanyang Link, Singapore 637371

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Nripan Mathews, presentation 175
Publication date: 5th February 2015

The excellent electronic properties of CH₃NH₃PbI₃, especially the balanced electron and hole diffusion lengths¹, have situated this material in the forefront of solution processed photovoltaics, as well as an excellent candidate for light emission² and lasing applications³. Efficiencies higher than 20% have been achieved through incremental improvements of the perovskite solar cell performances, mainly by means of the development of new device architectures and the use of innovative fabrication processes. Although these strategies have had great successes, it is essential to expand the family with new materials which can match the advantages of CH₃NH₃PbI₃ and simultaneously solve some of its drawbacks, such as low moisture stability and toxicity. The perovskite family offers rich multitudes of crystal structures and substituents with the potential to uncover new and exciting photophysical phenomena that hold the promise of higher solar cell efficiencies,the search for Pb-free perovskites have naturally shifted to other transition metal cations and formulations that replace the organic moiety. We present an approach which opens new routes to the design of alternative perovskites. Lower dimensionality and lead-free perovskites, including Cu and Sn-based (Figure 1), are analyzed in different systems, examining their promising behavior and elucidating their limitations.
Band gap variation of CsSnI3-xBrx w.r.t Br- concentration. The inset shows the photographs of samples - CsSnI3, CsSnI2Br, CsSnIBr2 and CsSnBr3 from left to right
1. G. Xing, N. Mathews, S. Sun, S. S. Lim, Y. M. Lam, M. Gratzel, S. Mhaisalkar and T. C. Sum, Science, 2013, 342, 344-347. 2. Z.-K. Tan, R. S. Moghaddam, M. L. Lai, P. Docampo, R. Higler, F. Deschler, M. Price, A. Sadhanala, L. M. Pazos, D. Credgington, F. Hanusch, T. Bein, H. J. Snaith and R. H. Friend, Nature Nanotechnology, 2014, 1-6. 3. G. Xing, N. Mathews, S. S. Lim, N. Yantara, X. Liu, D. Sabba, M. Grätzel, S. Mhaisalkar and T. C. Sum, Nature materials, 2014, 13, 476-480.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.