skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Interpretation of inverted photocurrent transients in organic lead halide perovskite solar cells: proof of the field screening by mobile ions and determination of the space charge layer widths

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c6ee02914k· OSTI ID:1425387
 [1];  [1];  [1];  [2];  [2];  [3];  [1];  [2]; ORCiD logo [4]
  1. Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
  2. Imperial College, London (United Kingdom). Dept. of Physics
  3. Swansea Univ., Swansea (United Kingdom). Centre for Solar Energy Research
  4. Sunlight Scientific, Berkeley, CA (United States)

In Methyl Ammonium Lead Iodide (MAPI) perovskite solar cells, screening of the built-in field by mobile ions has been proposed as part of the cause of the large hysteresis observed in the current/voltage scans in many cells. Here, we show that photocurrent transients measured immediately (e.g. 100 μs) after a voltage step can provide direct evidence that this field screening exists. Just after a step to forward bias, the photocurrent transients are reversed in sign (i.e. inverted), and the magnitude of the inverted transients can be used to find an upper bound on the width of the space charge layers adjacent to the electrodes. This in turn provides a lower bound on the mobile charge concentration, which we find to be ≳1 x 1017 cm-3. Using a new photocurrent transient experiment, we show that the space charge layer thickness remains approximately constant as a function of bias, as expected for mobile ions in a solid electrolyte. We also discuss additional characteristics of the inverted photocurrent transients that imply either an unusually stable deep trapping, or a photo effect on the mobile ion conductivity.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); Engineering and Physical Sciences Research Council (EPSRC)
Grant/Contract Number:
EE0006707; EP/J002305/1; EP/M023532/1; EP/I019278/1; EP/M025020/1; EP/G037515/1; EP/M014797/1).
OSTI ID:
1425387
Journal Information:
Energy & Environmental Science, Vol. 10, Issue 1; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 125 works
Citation information provided by
Web of Science

References (47)

Ionic transport in hybrid lead iodide perovskite solar cells journal June 2015
Spatial Localization of Excitons and Charge Carriers in Hybrid Perovskite Thin Films journal July 2015
6.5% efficient perovskite quantum-dot-sensitized solar cell journal January 2011
Hysteresis and transient behavior in current–voltage measurements of hybrid-perovskite absorber solar cells journal January 2014
Photo-induced halide redistribution in organic–inorganic perovskite films journal May 2016
Inorganic caesium lead iodide perovskite solar cells journal January 2015
Modulating the Electron–Hole Interaction in a Hybrid Lead Halide Perovskite with an Electric Field journal December 2015
Can slow-moving ions explain hysteresis in the current–voltage curves of perovskite solar cells? journal January 2016
Unusual defect physics in CH 3 NH 3 PbI 3 perovskite solar cell absorber journal February 2014
Extremely Slow Photoconductivity Response of CH 3 NH 3 PbI 3 Perovskites Suggesting Structural Changes under Working Conditions journal July 2014
Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells journal May 2009
Iodine Migration and its Effect on Hysteresis in Perovskite Solar Cells journal January 2016
Anomalously large interface charge in polarity-switchable photovoltaic devices: an indication of mobile ions in organic–inorganic halide perovskites journal January 2015
Understanding the rate-dependent J–V hysteresis, slow time component, and aging in CH 3 NH 3 PbI 3 perovskite solar cells: the role of a compensated electric field journal January 2015
Efficient and stable large-area perovskite solar cells with inorganic charge extraction layers journal October 2015
Ionic polarization-induced current–voltage hysteresis in CH3NH3PbX3 perovskite solar cells journal February 2016
High-performance photovoltaic perovskite layers fabricated through intramolecular exchange journal May 2015
Modeling Anomalous Hysteresis in Perovskite Solar Cells journal September 2015
Drift mobility techniques for the study of electrical transport properties in insulating solids journal April 1969
Heterojunction Modification for Highly Efficient Organic–Inorganic Perovskite Solar Cells journal November 2014
Origin and elimination of photocurrent hysteresis by fullerene passivation in CH3NH3PbI3 planar heterojunction solar cells journal December 2014
Charge selective contacts, mobile ions and anomalous hysteresis in organic–inorganic perovskite solar cells journal January 2015
Photovoltaic Switching Mechanism in Lateral Structure Hybrid Perovskite Solar Cells journal June 2015
Ionic charging by local imbalance at interfaces in hybrid lead halide perovskites journal January 2016
Giant switchable photovoltaic effect in organometal trihalide perovskite devices journal December 2014
Ion Migration in Organometal Trihalide Perovskite and Its Impact on Photovoltaic Efficiency and Stability journal January 2016
The dynamics of methylammonium ions in hybrid organic–inorganic perovskite solar cells journal May 2015
A vacuum flash–assisted solution process for high-efficiency large-area perovskite solar cells journal June 2016
Observable Hysteresis at Low Temperature in “Hysteresis Free” Organic–Inorganic Lead Halide Perovskite Solar Cells journal July 2015
Local Time-Dependent Charging in a Perovskite Solar Cell journal July 2016
Photoferroelectric and Photopiezoelectric Properties of Organometal Halide Perovskites journal April 2016
Native Defect-Induced Hysteresis Behavior in Organolead Iodide Perovskite Solar Cells journal January 2016
Giant photostriction in organic–inorganic lead halide perovskites journal April 2016
Intrinsic slow charge response in the perovskite solar cells: Electron and ion transport journal October 2015
Anomalous Hysteresis in Perovskite Solar Cells journal April 2014
Ion Migration and the Role of Preconditioning Cycles in the Stabilization of the J - V Characteristics of Inverted Hybrid Perovskite Solar Cells journal October 2015
Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis journal December 2016
The Interface between FTO and the TiO 2 Compact Layer Can Be One of the Origins to Hysteresis in Planar Heterojunction Perovskite Solar Cells journal May 2015
Mapping the Photoresponse of CH 3 NH 3 PbI 3 Hybrid Perovskite Thin Films at the Nanoscale journal May 2016
Fabrication of Planar Heterojunction Perovskite Solar Cells by Controlled Low-Pressure Vapor Annealing journal January 2015
Spatially Non-uniform Trap State Densities in Solution-Processed Hybrid Perovskite Thin Films journal February 2016
Optoelectronic Studies of Methylammonium Lead Iodide Perovskite Solar Cells with Mesoporous TiO 2 : Separation of Electronic and Chemical Charge Storage, Understanding Two Recombination Lifetimes, and the Evolution of Band Offsets during JV Hysteresis journal April 2015
Polarization Switching and Light-Enhanced Piezoelectricity in Lead Halide Perovskites journal April 2015
Enhancing the Hole-Conductivity of Spiro-OMeTAD without Oxygen or Lithium Salts by Using Spiro(TFSI) 2 in Perovskite and Dye-Sensitized Solar Cells journal July 2014
Ion Migration in Organometal Trihalide Perovskite and Its Impact on Photovoltaic Efficiency and Stability text January 2016
Photo-induced halide redistribution in organic-inorganic perovskite films. text January 2016
Origin and elimination of photocurrent hysteresis by fullerene passivation in CH3NH3PbI3 planar heterojunction solar cells text January 2014

Cited By (19)

From Nanostructural Evolution to Dynamic Interplay of Constituents: Perspectives for Perovskite Solar Cells journal March 2018
Ion-Migration Inhibition by the Cation-π Interaction in Perovskite Materials for Efficient and Stable Perovskite Solar Cells journal June 2018
Reverse Bias Behavior of Halide Perovskite Solar Cells journal December 2017
Device Physics of Hybrid Perovskite Solar cells: Theory and Experiment journal February 2018
Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells journal January 2018
Ion Migration: A “Double‐Edged Sword” for Halide‐Perovskite‐Based Electronic Devices journal November 2019
Molecularly Designed Zinc (II) Phthalocyanine Derivative as Dopant‐Free Hole‐Transporting Material of Planar Perovskite Solar Cell with Preferential Face‐on Orientation journal November 2019
Efficient ambient-air-stable solar cells with 2D–3D heterostructured butylammonium-caesium-formamidinium lead halide perovskites journal August 2017
Charge Injection, Carriers Recombination and HOMO Energy Level Relationship in Perovskite Solar Cells journal July 2017
Correlating hysteresis phenomena with interfacial charge accumulation in perovskite solar cells journal January 2020
Interfacial recombination kinetics in aged perovskite solar cells measured using transient photovoltage techniques journal January 2019
Research Update: Recombination and open-circuit voltage in lead-halide perovskites journal October 2018
Thermally activated, light-induced electron-spin-resonance spin density reflected by photocurrents in a perovskite solar cell journal January 2019
Research progress on organic–inorganic halide perovskite materials and solar cells journal February 2018
Inverted hysteresis in MAPbI 3 perovskite solar cells induced by presetting bias voltage journal May 2019
Identification of defects and defect energy distribution in the perovskite layer of MAPbI 3−x Cl x perovskite solar cell journal August 2019
High open-circuit voltages in lead-halide perovskite solar cells: experiment, theory and open questions journal July 2019
Molecularly Designed Zinc (II) Phthalocyanine Derivative as Dopant‐Free Hole‐Transporting Material of Planar Perovskite Solar Cell with Preferential Face‐on Orientation journal June 2019
Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells journal June 2017