Symmetry‐Breaking Induced Dipole Enhancement for Efficient Spiro‐Type Hole Transporting Materials: Easy Synthesis with High Stability

Author:

Xu Jianbin123,Xiong Qiu123,Huang Xiaofeng45,Sun Pingping6,Zhou Qin123,Du Yitian7,Zhang Zilong12,Gao Peng123ORCID

Affiliation:

1. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China

2. Laboratory for Advanced Functional Materials Xiamen Institute of Rare Earth Materials Haixi Institute Chinese Academy of Sciences Xiamen 361021 China

3. University of Chinese Academy of Sciences Beijing 100049 China

4. College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

5. Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen 361102 China

6. Department of Chemistry School of Science Hainan University Haikou 570228 P. R. China

7. Instisute of Materials Physical Chemistry Huaqiao University Xiamen 361021 China

Abstract

AbstractSpiral cores are crucial for designing efficient hole transporting materials (HTMs) for perovskite solar cells (PSCs), owing to their no‐planar 3D architecture, high thermal stability, good solubility, and beneficial solid‐state morphology. A lack of facile synthetic procedures for the spiral core limited the development of novel and stable spiral HTMs. In this regard, a one‐step reaction is adopted to produce several novel acceptor‐embedded spiral cores containing electron‐withdrawing carbonyl group embedded orthogonal spiral conformation. After coupling with triphenylamine donors, symmetry‐breaking spiral HTMs with uneven charge distribution can be obtained, bearing the advantages of adjustable dipole moment and enhanced structural stability. A combined theoretical and experimental study shows that the HTM with a stronger dipole moment can easily adsorb on the surface of perovskite via electrostatic potential, and the closer distance promoted facile hole transfer from perovskite to HTMs. In the end, PSCs based on strongly polarized spiro‐BC‐OMe achieved efficient hole extraction and thus an improved fill factor, promoting a power conversion efficiency (PCE) of 22.15%, and a module‐based PCE of 18.61% with an active area of 16.38 cm2. This study provides a new avenue for designing HTMs with strong dipole moments for efficient PSCs.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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