Effects of Modified Phthalocyanine as Hole-Transporting Materials in Perovskite Solar Cells
Takayuki Shimizu a, Mitsuhiro Adachi a, Akira Suzuki a, Rie Watanabe a, Mareedu Sreenivasu a, Devoju Harinada Chary a, Satish Bykkam a, Katsuya Tsuchimoto a, Junji Nakajima b, Toshiyuki Sano b, Katsuyoshi Mizumoto b
a AISIN COSMOS R&D Co., Ltd., Kariya, Aichi 448-8650, Japan
b AISIN SEIKI Co., Ltd., Kariya, Aichi 448-8650, Japan
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Takayuki Shimizu, 206
Publication date: 11th February 2019

Perovskite solar cell (PSC) is an attractive device and since its discovery high conversion efficiencies exceeding 20 % have been found in a short period of time. These high conversion efficiency cells were obtained by combining a mixed-cation mixed-halide type perovskite and the 2,2',7,7'-tetrakis-(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD). However, Spiro-OMeTAD is relatively expensive among the component materials of PSCs. To reduce power generation costs, it is important to replace them with low cost materials. Therefore, we focused on Phthalocyanine which is used extensively as a pigment and an organic semiconductor, and synthesized various derivatives as soluble hole-transporting materials (HTM).

In this presentation, we show the evaluation results of the dopant concentration dependences of the conversion efficiency of PSC using the phthalocyanine derivative as HTM (Pc-HTM). PSCs with doped Pc-HTM showed an increase in conversion efficiency as the dopant concentration increased. Besides that, the highest occupied molecular orbital (HOMO) energy level of Pc-HTM film also changed. Here, HOMO energy level was estimated from the ionization potential measured by ultraviolet photoelectron spectroscopy. As the dopant concentration increased, HOMO energy level decreased and the preferred HOMO energy level for the perovskite layer appeared under certain conditions. It supports that electronic energy level mismatch between HTM and perovskite results in a Voc loss. By optimization, PSC showed conversion efficiency up to 15.6 % using our phthalocyanine derivative and showed its effectiveness as HTM.

  

This presentation is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).

© Fundació Scito
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info