反式钙钛矿太阳电池中钾离子掺杂NiO提升电荷收集能力研究  

Enhancement of charge collection capability by potassium-doped NiO in inverted planar perovskite solar cells

作　　者：赵兴[1] 李丹妮 李美成[1] Zhao Xing;Li Dan-Ni;Li Mei-Cheng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,School of New Energy,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学新能源学院,新能源电力系统国家重点实验室,北京102206

出　　处：《物理学报》2024年第24期218-226,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:22409061,52232008,51972110,52102245,52072121);北京市自然科学基金(批准号:2222076,2222077);华能集团科技项目(批准号:HNKJ20-H88);中央高校基本科研业务费(批准号:2023MS047,2023MS042)资助的课题.

摘　　要：反式钙钛矿太阳电池(perovskite solar cell,PSC)是当前钙钛矿电池领域的重点发展方向,其中,NiO作为一种无机空穴传输材料,具有良好的化学稳定性,被广泛用于制备反式结构器件.然而,由于NiO的电导率和空穴迁移率相对较低且与钙钛矿薄膜的界面接触较差,使其在实现高性能反式PSC方面存在困难.为克服上述问题,本工作采用乙酸钾为钾源,通过在NiO纳米晶中掺入钾离子(K+)有效提升了NiO的电导率和空穴迁移率.此外,掺杂K+后,NiO与钙钛矿薄膜之间具有更好的界面接触,光生电荷的分离更有利.实验结果表明,最优的K+掺杂摩尔分数为3%,经过K+掺杂后电池效率从15.15%提高到16.75%,这主要得益于短路电流密度和填充因子的提升.Perovskite solar cells(PSCs)with inverted structures have received significant attention in the field of photovoltaics.NiO is one of the commonly explored hole transport materials(HTMs)because of its excellent chemical stability in comparison with organic materials.Pure NiO is an insulator,but the presence of nickel vacancies can lead to the formation of Ni3+ions,resulting in p-type semiconductor properties.However,the low conductivity and poor interfacial contact between NiO and perovskite thin films still pose challenges in achieving high-performance inverted PSCs.To solve these problems,potassium acetate is used as a potassium source for a nickel precursor,and therefore potassium ions(K+)are doped into NiO nanocrystals.The introduction of K+into NiO leads to the formation of Ni3+ions,thereby increasing the conductivity and hole mobility of NiO.Furthermore,K+-doped NiO exhibits better interface contact with the perovskite film,facilitating the efficient separation of photo-generated charges and showing a strong photoluminescence quenching effect.Experimental results demonstrate that the optimal concentration of K+doping is 3%,and the PSCs prepared with K+-doped NiO exhibit a significant increase in efficiency,from 15.15%to 16.75%,which is attributed primarily to the improvements in the short-circuit current density and fill factor.These improvements highlight the importance of enhanced conductivity and better interfacial contact achieved through K+doping for charge carrier collection,effectively addressing the limitations of NiO in inverted PSCs.

关 键 词：反式钙钛矿太阳电池 氧化镍 钾离子掺杂 电荷收集 

分 类 号：TM914.4[电气工程—电力电子与电力传动]