The Photophysics of Multidimensional Perovskites for High-Stability Solar Cells
Tze-Chien Sum a, Mingjie Li a, Nripan Mathews b, Subodh Mhaisalkar b, Saikat Bhaumik c
a School of Physical and Mathematical Sciences Nanyang Technological University, 21 Nanyang Link, Singapore, 637371
b School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue
c Energy Research Institute @ NTU (ERI@N)
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Invited Speaker, Tze-Chien Sum, presentation 054
Publication date: 7th November 2016

In a span of four years, organic−inorganic lead halide based Perovskite Solar Cells have exceeded solar conversion efficiencies of 22%. Despite the promising progress in improving the efficiency of CH3NH3PbI3 solar cells, long-term stability is one of the key issues that must be addressed before any market viability of perovskite solar cells could be suggested. 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 high stability and high efficiency solar cells.

One of the first work in mixed-dimensionality perovskite, a mixture of layered (2D) and 3D perovskites was reported in the form of (PEA)2(MA)2[Pb3I10], (with PEA = C6H5(CH2)2NH3+ and MA = CH3NH3+) [1]. This material displayed a 2D and 3D mixed perovskite structure with promising efficiency, and stability against moisture. We have recently pursued a similar approach where mixed dimensionality perovskites were formed as (MA)n-1(EAI)2PbnX3n+1, with EAI = CH3CH2NH3I [2], where tunability of bandgaps and improved stability was brought about. Yet another approach of formation of bilayers (in nanoparticles) was also demonstrated by our team recently where a 2D layered perovskite (OA)2PbBr4 was formed on top of MAPbBr3 perovskite, OA =CH3(CH2)7NH[3]. These examples establish the viability of using 2D-3D mixed dimensionality or multidimensionality perovskites for both bandgap tunability and stability.

This presentation will outline a broad palette of elemental substitutions, and multidimensional families [4] that will provide the next step towards the advances of the perovskite solar cells and light-emitting devices. I will also focus on the novel charge dynamics in the low and multi-dimensional perovskite system. Challenges and opportunities in perovskite materials beyond methyl ammonium lead iodide [4], with particular emphasis on their optoelectronic properties and integration into solar cells and light-emitting devices [5], will also be addressed. 

References 

[1]    I.C. Smith, E.T. Hoke, D. Solis-Ibarra, et al. “A Layered Hybrid Perovskite Solar-Cell Absorber with Enhanced Moisture Stability”, Angew. Chem. Int. Ed., 2014, 53(42), 11232-11235.

[2]    T.M. Koh, V. Shanmugam, J. Schlipf et al. “Nanostructuring Mixed-Dimensional Perovskites: A Route Toward Tunable, Efficient Photovoltaics”, Adv. Mater., 2016, 28(19), 3653-3661.

[3]    S Bhaumik, SA Veldhuis, YF Ng, MJ Li, SK Muduli, TC Sum, B Damodaran, SG Mhaisalkar, N Mathews, Highly stable, luminescent core-shell type methylammonium-octylammonium lead bromide layered perovskite nanoparticles, Chem Comm, 52(44): 7118-7121, 2016

[4]    P.P. Boix, S. Agarwala, T.M. Koh, N. Mathews, S.G. Mhaisalkar. “Perovskite Solar Cells: Beyond Methylammonium Lead Iodide”, Feature Article - J. Phys. Chem. Lett., 2015, 6(5): 898-907.

[5]    S Veldhius, PP Boix, N Yantara, M Li, TC Sum, N Mathews, and SG Mhaisalkar, “Perovskite Materials for Light-Emitting Diodes and Lasers,” Advanced Materials, 2016, DOI: 10.1002/adma.201600669.



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