Origin of High Efficiency and Long-Term Stability in Ionic Liquid Perovskite Photovoltaic

Environment-friendly protic amine carboxylic acid ionic liquids (ILs) as solvents is a significant breakthrough with respect to traditional highly coordinating and toxic solvents in achieving efficient and stable perovskite solar cells (PSCs) with a simple one-step air processing and without an antisolvent treatment approach. However, it remains mysterious for the improved efficiency and stability of PSCs without any passivation strategy. Here, we unambiguously demonstrate that the three functions of solvents, additive, and passivation are present for protic amine carboxylic acid ILs. We found that the ILs have the capability to dissolve a series of perovskite precursors, induce oriented crystallization, and chemically passivate the grain boundaries. This is attributed to the unique molecular structure of ILs with carbonyl and amine groups, allowing for strong interaction with perovskite precursors by forming C=O…Pb chelate bonds and N-H…I hydrogen bonds in both solution and film. This finding is generic in nature with extension to a wide range of IL-based perovskite optoelectronics.

[1]  S. Priya,et al.  A Nonionic and Low-Entropic MA(MMA)nPbI3-Ink for Fast Crystallization of Perovskite Thin Films , 2020 .

[2]  Yuanhui Sun,et al.  Efficient and stable Ruddlesden–Popper perovskite solar cell with tailored interlayer molecular interaction , 2020 .

[3]  N. Park,et al.  Scalable fabrication and coating methods for perovskite solar cells and solar modules , 2020, Nature Reviews Materials.

[4]  Shangfeng Yang,et al.  Successively Regioselective Electrosynthesis and Electron Transport Property of Stable Multiply Functionalized [60]Fullerene Derivatives , 2020, Research.

[5]  M. Green,et al.  Acetic Acid Assisted Crystallization Strategy for High Efficiency and Long‐Term Stable Perovskite Solar Cell , 2020, Advanced science.

[6]  Yang Yang,et al.  Constructive molecular configurations for surface-defect passivation of perovskite photovoltaics , 2019, Science.

[7]  Jihuai Wu,et al.  High-Performance and Hysteresis-Free Perovskite Solar Cells Based on Rare-Earth-Doped SnO2 Mesoporous Scaffold , 2019, Research.

[8]  G. Cao,et al.  Engineering Halide Perovskite Crystals through Precursor Chemistry. , 2019, Small.

[9]  Xingyu Gao,et al.  Oriented and Uniform Distribution of Dion–Jacobson Phase Perovskites Controlled by Quantum Well Barrier Thickness , 2019, Solar RRL.

[10]  L. Guo,et al.  High-Energy Photon Spectroscopy Using All Solution-Processed Heterojunctioned Surface-Modified Perovskite Single Crystals. , 2019, ACS applied materials & interfaces.

[11]  Yi Cui,et al.  Unravelling Atomic Structure and Degradation Mechanisms of Organic-Inorganic Halide Perovskites by Cryo-EM. , 2019, Joule.

[12]  Feng Gao,et al.  Planar perovskite solar cells with long-term stability using ionic liquid additives , 2019, Nature.

[13]  Hongzheng Chen,et al.  Manipulating the Mixed‐Perovskite Crystallization Pathway Unveiled by In Situ GIWAXS , 2019, Advanced materials.

[14]  Wei Huang,et al.  Room-Temperature Molten Salt for Facile Fabrication of Efficient and Stable Perovskite Solar Cells in Ambient Air , 2019, Chem.

[15]  Minsu Jung,et al.  Perovskite precursor solution chemistry: from fundamentals to photovoltaic applications. , 2019, Chemical Society reviews.

[16]  Wei Huang,et al.  Efficient and Stable Low-Dimensional Ruddlesden-Popper Perovskite Solar Cells Enabled by Reducing Tunnel Barrier. , 2019, The journal of physical chemistry letters.

[17]  Ligang Wang,et al.  A Eu3+-Eu2+ ion redox shuttle imparts operational durability to Pb-I perovskite solar cells , 2019, Science.

[18]  T. Leijtens,et al.  Understanding Degradation Mechanisms and Improving Stability of Perovskite Photovoltaics. , 2018, Chemical reviews.

[19]  Wei Huang,et al.  Management of Crystallization Kinetics for Efficient and Stable Low‐Dimensional Ruddlesden–Popper (LDRP) Lead‐Free Perovskite Solar Cells , 2018, Advanced science.

[20]  Weijian Chen,et al.  Universal passivation strategy to slot-die printed SnO2 for hysteresis-free efficient flexible perovskite solar module , 2018, Nature Communications.

[21]  L. Qiu,et al.  Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules , 2018, Nature Communications.

[22]  Wenjun Zhang,et al.  In-situ cross-linking strategy for efficient and operationally stable methylammoniun lead iodide solar cells , 2018, Nature Communications.

[23]  S. Mathur,et al.  Protic ionic liquid assisted solution processing of lead halide perovskites with water, alcohols and acetonitrile , 2018, Nano Energy.

[24]  Dong Yang,et al.  High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2 , 2018, Nature Communications.

[25]  Rui Zhu,et al.  Enhanced photovoltage for inverted planar heterojunction perovskite solar cells , 2018, Science.

[26]  S. Pang,et al.  Continuous Grain-Boundary Functionalization for High-Efficiency Perovskite Solar Cells with Exceptional Stability , 2018, Chem.

[27]  Jinsong Huang,et al.  Defect passivation in hybrid perovskite solar cells using quaternary ammonium halide anions and cations , 2017, Nature Energy.

[28]  Biaohua Chen,et al.  Introduction: Ionic Liquids. , 2017, Chemical reviews.

[29]  Michael Grätzel,et al.  The rapid evolution of highly efficient perovskite solar cells , 2017 .

[30]  M. Toney,et al.  Evolution of Iodoplumbate Complexes in Methylammonium Lead Iodide Perovskite Precursor Solutions , 2017 .

[31]  Henry J. Snaith,et al.  A low viscosity, low boiling point, clean solvent system for the rapid crystallisation of highly specular perovskite films , 2017 .

[32]  Manas R. Parida,et al.  Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films , 2016, Nature Communications.

[33]  Jinsong Huang,et al.  Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals. , 2016, Physical chemistry chemical physics : PCCP.

[34]  M. Li,et al.  High Efficiency Pb–In Binary Metal Perovskite Solar Cells , 2016, Advanced materials.

[35]  Seonhee Lee,et al.  Self-formed grain boundary healing layer for highly efficient CH3NH3PbI3 perovskite solar cells , 2016, Nature Energy.

[36]  Yang Yang,et al.  High-efficiency robust perovskite solar cells on ultrathin flexible substrates , 2016, Nature Communications.

[37]  M. Saidaminov,et al.  Retrograde solubility of formamidinium and methylammonium lead halide perovskites enabling rapid single crystal growth. , 2015, Chemical communications.

[38]  U. Wiesner,et al.  Direct Crystallization Route to Methylammonium Lead Iodide Perovskite from an Ionic Liquid , 2015 .

[39]  Leone Spiccia,et al.  A fast deposition-crystallization procedure for highly efficient lead iodide perovskite thin-film solar cells. , 2014, Angewandte Chemie.

[40]  Sang Il Seok,et al.  Solvent engineering for high-performance inorganic-organic hybrid perovskite solar cells. , 2014, Nature materials.

[41]  Ming Li,et al.  Supersymmetric laser arrays , 2019, Journal of Semiconductors.