Improving the Long-term Stability of Perovskite Solar Cells with a Porous Al

Abstract Hybrid perovskites represent a new paradigm for photovoltaics, which have the potential to overcome the performance limits of current technologies and achieve low cost and high versatility. However, an efficiency drop is often observed within the first few hundred hours of device operation, which could become an important issue. Here we demonstrate that the electrode’s metal migrating through the hole transporting material (HTM) layer and eventually contacting the perovskite is in part responsible for this early device degradation. We show that depositing the HTM within an insulating mesoporous “buffer layer” comprising of Al 2 O 3 nanoparticles, prevents the metal electrode migration while allowing for precise control of the HTM thickness. This enables an improvement in the solar cell fill factor and prevents degradation of the device after 350 hours of operation. TOC graphic Keywords: perovskite solar cells, stability, buffer layer, electric shunting pathway, photovoltaic, ageing test.

[1]  N. Robertson,et al.  Hole-transport materials with greatly-differing redox potentials give efficient TiO2-[CH3NH3][PbX3] perovskite solar cells. , 2015, Physical chemistry chemical physics : PCCP.

[2]  Giles Richardson,et al.  A Model for the Operation of Perovskite Based Hybrid Solar Cells: Formulation, Analysis, and Comparison to Experiment , 2014, SIAM J. Appl. Math..

[3]  Nakita K. Noel,et al.  Enhanced photoluminescence and solar cell performance via Lewis base passivation of organic-inorganic lead halide perovskites. , 2014, ACS nano.

[4]  Yang Yang,et al.  Interface engineering of highly efficient perovskite solar cells , 2014, Science.

[5]  Young Chan Kim,et al.  o-Methoxy substituents in spiro-OMeTAD for efficient inorganic-organic hybrid perovskite solar cells. , 2014, Journal of the American Chemical Society.

[6]  Konrad Wojciechowski,et al.  Supramolecular halogen bond passivation of organic-inorganic halide perovskite solar cells. , 2014, Nano letters.

[7]  Nakita K. Noel,et al.  Anomalous Hysteresis in Perovskite Solar Cells. , 2014, The journal of physical chemistry letters.

[8]  Yanhong Luo,et al.  Hole-conductor-free perovskite organic lead iodide heterojunction thin-film solar cells: High efficiency and junction property , 2014 .

[9]  Francisco Fabregat-Santiago,et al.  Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells. , 2014, The journal of physical chemistry letters.

[10]  Peng Gao,et al.  Impedance spectroscopic analysis of lead iodide perovskite-sensitized solid-state solar cells. , 2014, ACS nano.

[11]  Alain Goriely,et al.  Morphological Control for High Performance, Solution‐Processed Planar Heterojunction Perovskite Solar Cells , 2014 .

[12]  Sandeep Kumar Pathak,et al.  Overcoming ultraviolet light instability of sensitized TiO2 with meso-superstructured organometal tri-halide perovskite solar cells , 2013, Nature Communications.

[13]  Lioz Etgar,et al.  Depleted hole conductor-free lead halide iodide heterojunction solar cells , 2013 .

[14]  H. Hoppe,et al.  Polymer solar cells with enhanced lifetime by improved electrode stability and sealing , 2013 .

[15]  Giles Richardson,et al.  Asymptotic and numerical prediction of current-voltage curves for an organic bilayer solar cell under varying illumination and comparison to the Shockley equivalent circuit , 2013 .

[16]  G. Vitiello,et al.  Protic ionic liquids as p-dopant for organic hole transporting materials and their application in high efficiency hybrid solar cells. , 2013, Journal of the American Chemical Society.

[17]  M. Grätzel,et al.  Sequential deposition as a route to high-performance perovskite-sensitized solar cells , 2013, Nature.

[18]  J. Noh,et al.  Efficient inorganic–organic hybrid heterojunction solar cells containing perovskite compound and polymeric hole conductors , 2013, Nature Photonics.

[19]  H. Snaith,et al.  Low-temperature processed meso-superstructured to thin-film perovskite solar cells , 2013 .

[20]  J. Noh,et al.  Chemical management for colorful, efficient, and stable inorganic-organic hybrid nanostructured solar cells. , 2013, Nano letters.

[21]  J. Teuscher,et al.  Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites , 2012, Science.

[22]  N. Park,et al.  Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9% , 2012, Scientific Reports.

[23]  Suren A. Gevorgyan,et al.  Investigation of the degradation mechanisms of a variety of organic photovoltaic devices by combination of imaging techniques—the ISOS-3 inter-laboratory collaboration , 2012 .

[24]  P. Blom,et al.  Degradation mechanisms in organic photovoltaic devices , 2012 .

[25]  Michael Grätzel,et al.  Porphyrin-Sensitized Solar Cells with Cobalt (II/III)–Based Redox Electrolyte Exceed 12 Percent Efficiency , 2011, Science.

[26]  H. Snaith,et al.  Obviating the requirement for oxygen in SnO2-based solid-state dye-sensitized solar cells , 2011, Nanotechnology.

[27]  Kashif Ishaque,et al.  Simple, fast and accurate two-diode model for photovoltaic modules , 2011 .

[28]  Michael Grätzel,et al.  Pore‐Filling of Spiro‐OMeTAD in Solid‐State Dye Sensitized Solar Cells: Quantification, Mechanism, and Consequences for Device Performance , 2009 .

[29]  Tsutomu Miyasaka,et al.  Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. , 2009, Journal of the American Chemical Society.

[30]  P. Kamat.  Meeting the Clean Energy Demand: Nanostructure Architectures for Solar Energy Conversion , 2007 .

[31]  Ashraful Islam,et al.  Dye-Sensitized Solar Cells with Conversion Efficiency of 11.1% , 2006 .

[32]  Michelle V. Buchanan,et al.  Addressing Grand Energy Challenges through Advanced Materials , 2005 .

[33]  Paul B. Weisz,et al.  Basic Choices and Constraints on Long-Term Energy Supplies , 2004 .

[34]  Z. Popović,et al.  Rutherford backscattering and secondary ion mass spectrometry investigation of Mg:Ag–tris(8-hydroxy quinoline) aluminum interfaces , 2003 .

[35]  Y. Qiu,et al.  Study on the interaction between Ag and tris(8‐hydroxyquinoline) aluminum using x‐ray photoelectron spectroscopy , 2001 .

[36]  Y. Qiu,et al.  Dynamic SIMS characterization of interface structure of Ag/Alq3/NPB/ITO model devices , 2001 .

[37]  M. Grätzel,et al.  A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films , 1991, Nature.