journal article·2022-09-09

Resonant Molecular Modification for Energy Level Alignment in Perovskite Solar Cells

Yunjuan Niu, Yaole Peng, Xianxi Zhang, Yingke Ren, Rahim Ghadari, Jun Zhu, Gavin Tulloch, Hong Zhang, Polycarpos Falaras, Linhua Hu

ACS Energy Letters· Volume 7· Issue 9
Publisher page

Abstract

The energy level alignment at interfaces of perovskite solar cells (PSCs) is an essential factor determining their efficiency and stability. Therefore, an interface capable of appropriate energy band bending, minimal defects, and good contacts is the key issue for obtaining high-performing and stable PSCs. Herein, we present an innovative interface engineering approach employing an ortho-squaraine derivative with zwitterionic resonance structure, which can change the charge state of the perovskite surface to tune the energy level structure and can form π–π stacking with the hole-transporting material to shorten the carrier transmission distance and facilitate charge transfer. By the synergistic action of the double functionalization, the PSCs containing 3,4-Bis(4-bromophenyl)cyclobut-3-ene-1,2-dione achieved power conversion efficiency (PCE) of 23.82%, and the stability of the unencapsulated devices are greatly improved. For perovskite interfacial engineering, use of the resonant squaraine zwitterion is a promising chemical design element to enhance PSCs’ efficiency and stability.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China

University of Science and Technology of China, Hefei 230026, China

Storage & Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China

College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China

Computational Chemistry Laboratory, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran

Special Display and Imaging Technology Innovation Center of Anhui Province, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Academy of Opto-Electric Technology, Hefei University of Technology, Hefei 230009, China

National Center for Scientific Research “Demokritos”, Institute of Nanoscience and Nanotechnology (INN), Agia Paraskevi Attikis 153 10, Greece

Greatcell Energy, 280 Byrnes Road, Wagga Wagga, NSW 2650, Australia

School of Mathematics and Physics Science and Engineering, Hebei University of Engineering, Handan 056038, China

Anhui Institute of Innovation for Industrial Technology, Hefei 230088, China

Funding

Natural Science Foundation of Hebei Province · Ministry of Science and Technology of the People's Republic of China · West Light Foundation of the Chinese Academy of Sciences · Department of Education of Hebei Province · Hellenic Foundation for Research and Innovation · National Natural Science Foundation of China · Science and Technology Research Project for the Colleges and Universities in Hebei Province

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