Effects of heterofunctional alkali-metal formate doping on perovskite solar cell performance  

作　　者：Sakshi Thakur Sung-Nam Kwon Dilpreet Singh Mann Seok-In Na 

机构地区：[1]Department of Flexible and Printable Electronics and LANL-JBNU Engineering Institute-Korea,Jeonbuk National University,567,Baekje-daero,Deokjin-gu,Jeonju-si,54896,Republic of Korea

出　　处：《Journal of Materiomics》2022年第6期1165-1171,共7页无机材料学学报（英文）

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(2020R1I1A1A01051961 and 2021R1A2C2010353).

摘　　要：Various internal and external defects present in the perovskite film are one of the main factors that causelow efficiency and stability, and in order to realize high-performance perovskite solar cells, it is necessaryto develop a method to effectively suppress them. In this study, a heterofunctional dopants strategy wasattempted to integrate the effect of alkali metal cations (Rbþ and Kþ) and formate anion (HCOO) throughdoping engineering with alkali-metal formates, i.e., rubidium formate (RbHCOO) and potassium formate(KHCOO). Inclusive physical and photoelectric analysis revealed that doping with a small amount ofalkali-metal formate leads to crystal growth and reduction of grain boundaries, and further passivates orinhibits bulk and surface defects. As a result, the photogenerated charge recombination was reduced andthe charge carrier transport was improved, leading to improved PSC performance. RbHCOO-dopedinverted planar PSCs achieved a PCE of up to 20.41% with long-term stability. Our findings provide away for producing high-quality perovskite films with low defect densities that are essential for realizinghigh-performance PSCs.

关 键 词：Perovskite solar cells Heterofunctional dopant Alkali-metal formate Rubidium formate Potassium formate Reduction of the charge trap density 

分 类 号：O62[理学—有机化学]