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Dopant‐Free Hole‐Transporting Layer Based on Isomer‐Pure Tetra‐Butyl‐Substituted Zinc(II) Phthalocyanine for Planar Perovskite Solar Cells
Author(s) -
Dong Lei,
Hu Qikun,
Rezaee Ehsan,
Chen Qian,
Yang Songhe,
Cai Siyuan,
Liu Bingchen,
Pan Jia-Hong,
Xu Zong-Xiang
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900119
Subject(s) - dopant , materials science , phthalocyanine , energy conversion efficiency , tetra , perovskite (structure) , selectivity , zinc , fabrication , thermal stability , absorption (acoustics) , layer (electronics) , analytical chemistry (journal) , chemical engineering , nanotechnology , catalysis , optoelectronics , doping , organic chemistry , chemistry , medicine , alternative medicine , pathology , medicinal chemistry , metallurgy , composite material , engineering
Herein, the important role of the isomer purity of hole‐transporting materials (HTMs) in achieving high‐performance perovskite solar cells (PSCs) is highlighted. The isomer‐pure 2,9,16,24‐tetra‐ n ‐butyl‐Zn(II) phthalocyanine ( RE ‐ZnBu 4 Pc) is directly synthesized through a ring expansion method, without any further purification. The ground‐state absorption, fluorescence and thermal properties of RE ‐ZnBu 4 Pc and the isomer mixture ZnBu 4 Pc, along with their hole mobilities and film morphologies are investigated, proving that RE ‐ZnBu 4 Pc can be the more efficient HTM. The devices based on RE ‐ZnBu 4 Pc, as dopant‐free HTMs, achieve a higher average power conversion efficiency (PCE of 11.49% ± 0.67%) and more stability at 25 °C and under 75% relative humidity than that of isomer mixture ZnBu 4 Pc (PCE of 9.51% ± 1.15%). RE ‐ZnBu 4 Pc‐based PSCs also show better reproducibility in the fabrication process. This study demonstrates that better device performance can be expected for PSCs with isomer‐pure HTM materials.