In Situ Electrochemistry of Buried Interfaces in Metal Halide Perovskites: Probing Energy Bands, Halide Redox Activity, and Kinetics
Year: 2025
Type: article
Abstract: Control over charge injection and extraction processes across buried interfaces is fundamental for all (opto)electronic multilayer device platforms, necessitating detailed understanding of local structural and chemical differences that promote defect formation, distort energetic band‐edge alignments, and alter charge transport processes. Herein, the implementation of a low‐cost electroanalytical methodologies’ tool suite is described to quantitatively characterize buried interfaces and redox reactions in printable, mixed electrical–ionic, and redox‐active metal halide perovskites and a prototypical hole‐transporting nickel oxide (NiO x ) thin film. The objective is to demonstrate the power of electrochemical methodologies to improve the nanoscale understanding of complex interfaces within optoelectronic devices by providing case studies on how to: i) differentiate between electronic and chemical properties in NiO x contacts; ii) measure changes in reversibility of halide redox reactions via NiO x surface states; iii) assess energy alignment and charge transport across (modified) buried interfaces; and iv) quantify defects at buried interfaces that change with modifiers and differences in perovskite processing, including increasing defect concentrations when films are slot‐die‐coated versus spin‐cast. The collective approach addresses major challenges in understanding the precise energy landscape and interface reactivity under relevant electric fields that mimic operando conditions (away from equilibrium) and across length scales in thin film device formats.
Source: Advanced Energy Materials
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,790
Awards: G1137001843, G14908310, G216798575, G399272915, G645873479, G682227408, ADVANCE PEROVSKITE SOLAR CELL DEVELOPMENT AND STABILITY USING IN-LINE ELECTROCHEMICAL METHODOLOGIES.
THE GOAL OF THIS 12-MONTH PROJECT IS TO DEVELOP AND DEMONSTRATE A SIMPLE, EASILY IMPLEMENTED AND SCALABLE, NON-DESTRUCTIVE PROTOTYPE ELECTROCHEMICAL PROBE (TOP CONTACT) FOR THE: I) CHARACTERIZATION OF REACTIVE DEFECTS IN METAL HALIDE PEROVSKITE SOLAR CELL LAYERS DURING IN-LINE MANUFACTURING (E.G., ROLL-TO-ROLL COATING) AND II) ASSESSING QUALITY, STABILITY, AND DURABILITY OF DEVICE LAYERS UNDER OPERANDO CONDITIONS AND WITH ADDED EXTERNAL STRESSORS (I.E., HUMIDITY, LIGHT, AND TEMPERATURE), BY MONITORING TIME-DEPENDENT CHANGES TO REACTIVE DEFECT SPECIATION, ENERGETICS AND CONCENTRATIONS, FOR LOW DEFECT DENSITY PEROVSKITE ACTIVE LAYERS.
THE END GOAL OF THIS PROJECT WILL BE TO DELIVER A PROTOTYPE, IN-LINE ELECTROCHEMICAL PROBE TECHNOLOGY THAT CAN BE INTEGRATED INTO QUALITY CONTROL SYSTEMS FOR LARGE-AREA THIN FILMS IN THE HIGH-THROUGHPUT MANUFACTURING OF PEROVSKITE-BASED OPTO-ELECTRONIC/ENERGY CONVERSION PLATFORMS (MILESTONE 4). IN ACHIEVING THIS END GOAL, WE WILL INTEGRATE THE SENSOR ONTO A DEMONSTRATION ROBOTIC ARM., G7021897321, G847654844, G8876996369, G944719100
OpenAlex ID: W4414408445