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Novel cathode interfacial layer using creatine for enhancing the photovoltaic properties of perovskite solar cells

Title of paper
Novel cathode interfacial layer using creatine for enhancing the photovoltaic properties of perovskite solar cells
Author
[박태호교수 연구실] 크레아틴 전자전달층을 이용한 고효율 페로브스카이트 태양전지 개발
Publication in journal
Journal of Materials Chemistry A, 2020, 8, 21721
Publication date
20200929

 

[Abstract]


With the unprecedented development of perovskite solar cells (PSCs), various interlayers have been investigated. Interlayers have diverse roles in shifting the energy levels, attracting and extracting charges, and passivating surface traps. These can improve the stability of PSCs, as well as their power conversion efficiency (PCE). In this study, a small molecular self-assembled monolayer (2-[carbamimidoyl(methyl)amino]acetic acid) is introduced on a SnO2 layer. The acetic acid is known as creatine, existing naturally in the human body. It is eatable and dosed by athletes for energy. Due to its structural properties, creatine can be anchored on a SnO2 layer, thus, it can strengthen the charge extraction from a perovskite layer by forming interface dipoles and reducing the work function. Also, it can passivate the defects in the perovskite layer. These properties are comprehensively investigated via various experimental techniques. With the creatine layer as a cathode interfacial layer on the SnO2 layer, the PSC employing a triple cation-based perovskite achieves the highest PCE of 20.8% and retained 90% of it after 50 days. Furthermore, 22.1% of PCE is obtained from the formamidinium-based perovskite. This report represents an interesting application of creatine as an interlayer in PSCs and suggests the possible application of other essential amino acid

 

DOI: 10.1039/d0ta08239b
Link: https://pubs.rsc.org/en/content/articlepdf/2020/ta/d0ta08239b