Recently,there has been renewed interest in interface engineering as a means to further push the performance of perovskite solar cells closer to the Schockly-Queisser limit.Herein,for the first time we employ a multi-...Recently,there has been renewed interest in interface engineering as a means to further push the performance of perovskite solar cells closer to the Schockly-Queisser limit.Herein,for the first time we employ a multi-functional 4-chlorobenzoic acid to produce a self-assembled monolayer on a perovskite surface.With this interlayer we observe passivation of perovskite surface defects and a significant suppression of non-radiative charge recombination.Furthermore,at the surface of the interlayer we observe,charge dipoles which tune the energy level alignment,enabling a larger energetic driving force for hole extraction.The perovskite surface becomes more hydrophilic due to the presence of the interlayer.Consequently,we observe an improvement in open-circuit voltage from 1.08 to 1.16 V,a power conversion efficiency improvement from 18%to 21%and an improved stability under ambient conditions.Our work highlights the potential of SAMs to engineer the photo-electronic properties and stability of perovskite interfaces to achieve high-performance light harvesting devices.展开更多
The Cahn–Hilliard equations are a versatile model for describing the evolution of complex morphologies.In this paper we present a computational pipeline for the numerical solution of a ternary phase-field model for d...The Cahn–Hilliard equations are a versatile model for describing the evolution of complex morphologies.In this paper we present a computational pipeline for the numerical solution of a ternary phase-field model for describing the nanomorphology of donor–acceptor semiconductor blends used in organic photovoltaic devices.The model consists of two coupled fourth-order partial differential equations that are discretized using a finite element approach.In order to solve the resulting large-scale linear systems efficiently,we propose a preconditioning strategy that is based on efficient approximations of the Schur-complement of a saddle point system.We show that this approach performs robustly with respect to variations in the discretization parameters.Finally,we outline that the computed morphologies can be used for the computation of charge generation,recombination,and transport in organic solar cells.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.52073115,61874048,12073009)the Project of Science and Technology Development Plan of Jilin Province(Grant No.20200201085JC).
文摘Recently,there has been renewed interest in interface engineering as a means to further push the performance of perovskite solar cells closer to the Schockly-Queisser limit.Herein,for the first time we employ a multi-functional 4-chlorobenzoic acid to produce a self-assembled monolayer on a perovskite surface.With this interlayer we observe passivation of perovskite surface defects and a significant suppression of non-radiative charge recombination.Furthermore,at the surface of the interlayer we observe,charge dipoles which tune the energy level alignment,enabling a larger energetic driving force for hole extraction.The perovskite surface becomes more hydrophilic due to the presence of the interlayer.Consequently,we observe an improvement in open-circuit voltage from 1.08 to 1.16 V,a power conversion efficiency improvement from 18%to 21%and an improved stability under ambient conditions.Our work highlights the potential of SAMs to engineer the photo-electronic properties and stability of perovskite interfaces to achieve high-performance light harvesting devices.
基金the Deutsche Forschungsgemeinschaft(DFG)for funding this work(Research Unit FOR 5387 POPULAR,Project No.461909888).
文摘The Cahn–Hilliard equations are a versatile model for describing the evolution of complex morphologies.In this paper we present a computational pipeline for the numerical solution of a ternary phase-field model for describing the nanomorphology of donor–acceptor semiconductor blends used in organic photovoltaic devices.The model consists of two coupled fourth-order partial differential equations that are discretized using a finite element approach.In order to solve the resulting large-scale linear systems efficiently,we propose a preconditioning strategy that is based on efficient approximations of the Schur-complement of a saddle point system.We show that this approach performs robustly with respect to variations in the discretization parameters.Finally,we outline that the computed morphologies can be used for the computation of charge generation,recombination,and transport in organic solar cells.
