Atomically Dispersed Metal Atoms:Minimizing Interfacial Charge Transport Barrier for Efficient Carbon-Based Perovskite Solar Cells  

作　　者：Yanying Shi Xusheng Cheng Yudi Wang Wenrui Li Wenzhe Shang Wei Liu Wei Lu Jiashuo Cheng Lida Liu Yantao Shi 

机构地区：[1]State Key Laboratory of Fine Chemicals,Frontier Science Center for Smart Materials,School of Chemistry,Dalian University of Technology,Dalian 116024,People’s Republic of China [2]School of Narcotics Control and Public Order Studies,Criminal Investigation Police,University of China,Shenyang 110854,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第5期604-616,共13页纳微快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(22109019,52272193);Fundamental Research Funds for the Central Universities(DUT22LAB602,DUT23RC(3)002)。

摘　　要：Carbon-based perovskite solar cells(C-PSCs)exhibit notable stability and durability.However,the power conversion efficiency(PCE)is significantly hindered by energy level mismatches,which result in interfacial charge transport barriers at the electrode-related interfaces.Herein,we report a back electrode that utilizes atomically dispersed metallic cobalt(Co)in carbon nanosheets(Co_1/CN)to adjust the interfacial energy levels.The electrons in the d-orbitals of Co atoms disrupt the electronic symmetry of the carbon nanosheets(CN),inducing a redistribution of the electronic density of states that leads to a downward shift in the Fermi level and a significantly reduced interfacial energy barrier.As a result,the C-PSCs using Co1/CN as back electrodes achieve a notable PCE of 22.61%with exceptional long-term stability,maintaining 94.4%of their initial efficiency after 1000 h of continuous illumination without encapsulation.This work provides a promising universal method to regulate the energy level of carbon electrodes for C-PSCs and paves the way for more efficient,stable,and scalable solar technologies toward commercialization.

关 键 词：Perovskite solar cells Carbon electrode Charge transport Energy level alignment 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O646[理学—物理化学]