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Effective Lateral Mobility and Diffusion Length Determined by Refractive Index Change of Perovskite at the Sub-Bandgap : Photoinduced Reflection Spectroscopy

Fundacio Scito (2017)

Authors:

Jongchul Lim, Henry J Snaith
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Improving efficiency and stability in single and multi-junction perovskite solar cells

Fundacio Scito (2017)
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Self-assembled 2D-3D heterostructured butylammonium-caesium-formamidinium lead halide perovskites for stable and efficient solar cells

Fundacio Scito (2017)

Authors:

Zhiping Wang, Qianqian Lin, Francis Chmiel, Nobuya Sakai, Laura Herz, Henry Snaith
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The Importance of Interface Morphology for Hysteresis-Free Perovskite Solar Cells

Fundacio Scito (2017)

Authors:

Jay Patel, Jennifer Wong-Leung, Stephan Van Reenen, Nobuya Sakai, Jacob Wang, Elizabeth Parrott, Mingzhen Liu, Henry Snaith, Laura Herz, Michael Johnston
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Unveiling the influence of pH on the crystallization of hybrid perovskites, felivering low voltage loss photovoltaics

Joule Cell Press 1:2 (2017) 328-343

Authors:

Nakita Noel, M Congiu, Alexandra J Ramadan, S Fearn, David P McMeekin, Jay B Patel, Michael B Johnston, Bernard Wenger, Henry J Snaith

Abstract:

Impressive power conversion efficiencies coupled with the relative ease of fabrication have made perovskite solar cells a front runner for next-generation photovoltaics. Although perovskite films and optoelectronic devices have been widely studied, relatively little is known about the chemistry of the precursor solutions. Here, we present a study on the hydrolysis of N,N-dimethylformamide, correlating how pH changes related to its degradation affect the crystallization of MAPbI3xClx perovskite films. By careful manipulation of the pH, and the resulting colloid distribution in precursor solutions, we fabricate perovskite films with greatly improved crystallinity, which when incorporated into photovoltaic devices reproducibly yield efficiencies of over 18%. Extending this method to the mixed cation, mixed halide perovskite FA0.83MA0.17Pb(I0.83Br0.17)3, we obtain power conversion efficiencies of up to 19.9% and open-circuit voltages of 1.21 V for a material with a bandgap of 1.57 eV, achieving the lowest yet reported loss in potential from bandgap to a VOC of only 360 mV.
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