Perovskite-Perovskitoid Surface Composition for Defect Passivation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic metal halide perovskite solar cells face challenges due to defects formed during solution processing, which affect the performance and stability of three-dimensional perovskite-based solar cells, particularly due to charge-extraction barriers and surface defects.
Innovation Solution
A composition comprising a first layer of perovskite with a crystalline structure defined by ABX3 and a second layer of perovskitoid with a crystalline structure defined by A′B2X6, where A′ is a third cation with either a 1+ or 2+ charge, and the perovskitoid layer has a characteristic length between 2.53 Å and 7.62 Å, improving charge transport and reducing surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If low-dimensional (LD) structures based on bulky organic cations are used to improve performance and stability, then stability is improved, but charge extraction is inhibited and device performance deteriorates
Solution Approach 1:
The invention divides the perovskite structure into distinct dimensional layers: a three-dimensional perovskite layer (ABX3) for optimal charge generation and transport, and a two-dimensional perovskite layer (A′B2X6) for stability and defect passivation. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between stability and charge extraction performance.
Solution Approach 2:
The invention applies different structural qualities to different regions of the solar cell: the bulk 3D perovskite provides high charge carrier mobility and efficient charge transport, while the surface 2D perovskite layer provides enhanced stability and surface defect passivation. This local differentiation of material properties allows the device to simultaneously achieve high performance and improved stability.
2Ease of manufacture
If solution processing is used for manufacturing PSCs on a manufacturing scale, then ease of manufacture is improved, but surface defects increase and performance deteriorates
Solution Approach 1:
The invention incorporates surface passivation and defect reduction steps into the solution processing sequence before final device assembly. By performing preliminary surface treatment during the manufacturing process, the method maintains ease of manufacture while significantly reducing surface defect density and improving device performance.
Solution Approach 2:
The invention uses a composite perovskite structure combining 3D and 2D phases, where the 2D perovskite layer acts as a surface modification layer formed through solution processing. This composite approach maintains the benefits of solution processing while the 2D layer specifically addresses surface defect issues, achieving both ease of manufacture and high manufacturing precision.
Data Source
AI summary
The present disclosure relates to a composition that includes a first layer that includes a perovskite and a second layer that includes a perovskitoid, where the perovskite has a first crystalline structure defined by ABX3, the perovskitoid has a second crystalline structure defined by A′B2X6, where A is a first cation, B is a second cation, X is an anion, and A′ is a third cation having either a 1+ charge or a 2+ charge.