AUTHOR=Feng Xiang , Wang Yuheng , Xiao Tong , Shen Zichao , Ren Yurong , Lu Guanghao , Bu Laju 

TITLE=In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00211

DOI=10.3389/fchem.2020.00211

ISSN=2296-2646

ABSTRACT=<p>Organic donor–acceptor bulk heterojunction are attracting wide interests for solar cell applications due to solution processability, mechanical flexibility, and low cost. The photovoltaic performance of such thin film is strongly dependent on vertical phase separation of each component. Although film-depth-dependent light absorption spectra measured by non-<italic>in situ</italic> methods have been used to investigate the film-depth profiling of organic semiconducting thin films, the <italic>in situ</italic> measurement is still not well-resolved. In this work, we propose an <italic>in situ</italic> measurement method in combination with a self-developed <italic>in situ</italic> instrument, which integrates a capacitive coupled plasma generator, a light source, and a spectrometer. This <italic>in situ</italic> method and instrument are easily accessible and easily equipped in laboratories of the organic electronics, which could be used to conveniently investigate the film-depth-dependent optical and electronic properties.</p>