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Published on: January 10, 2017
Hydroxy Diphosphonic Acid-Anchored Self-Assembled Monolayers Enable Annealing-Free High-Efficiency Hole Transport
Haishuo Guo1, Guodong Yang1, Andong Zhang1
1College of Textiles and Clothing, Qingdao University, Qingdao, 266071, China.
Abstract:
This study presents a novel carbazole derivative functionalized with hydroxy diphosphonic acid groups (HDPACz) as an efficient annealing-free hole transport layer (HTL) through strong bidentate anchoring to indium tin oxide (ITO). Compared to conventional mono-phosphonic acid counterparts, HDPACz demonstrates superior ITO surface coverage and interfacial dipole, effectively modulating the work function of ITO. Theoretical calculations reveal enhanced adsorption energy (-3.95 vs -1.87 eV for 2PACz) and interfacial dipole strength in HDPACz. Organic solar cells (OSCs) employing 1-HDPACz achieve a remarkable power conversion efficiency (PCE) of 19.38% with a high fill factor (77.22%). This work provides a new strategy for developing cost-effective and scalable annealing-free HTLs for high-performance photovoltaics.

