Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Publication date: 14th October 2019
Hole-transporting layers often effect on the photovoltaic performance and the device durability of perovskite solar cells. Poly(triarylamine)s are one of the typical hole transporting materials, which are often coated with the addition of a lithium salt and a pyridine derivative, so called dopants, on the perovskite layer. The dopants improve the photovoltaic performance but reduce the device durability because of their migration also into the perovskite layer[1]. In this presentation, effects and roles of the dopants both on the hole-transporting layer and on the device performance such as a carrier hole generation and a high quality layer formation of the hole-transporting material were studied by using poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA). A metal-dopant-free PTAA was prepared and examined on the passivated perovskite layer. For example, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) cation was applied as the oxidizing dopant of the hole-transporting material. The dopant residue, i.e. TEMPO, was easily removed through its elimination from the PTAA layer. The PTAA layer with ca. 100 nm thickness covered even rough surface of the perovskite layer and displayed photovoltaic performance of almost 20% and durability.
This work was partially supported by NEDO project, Japan.
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