Photocurrent spectroscopy of perovskite layers and solar cells: a sensitive probe of material degradation

0486914 - FZÚ 2018 RIV US eng J - Journal Article
Holovský, Jakub - De Wolf, S. - Werner, J. - Remeš, Zdeněk - Müller, Martin - Neykova, Neda - Ledinský, Martin - Černá, L. - Hrzina, P. - Löper, P. - Niesen, B. - Ballif, C.
Photocurrent spectroscopy of perovskite layers and solar cells: a sensitive probe of material degradation.
Journal of Physical Chemistry Letters. Roč. 8, č. 4 (2017), s. 838-843. ISSN 1948-7185
R&D Projects: GA ČR GJ17-26041Y; GA MŠMT LM2015087
Grant - others:AV ČR(CZ) KONNECT-007
Program: Bilaterální spolupráce
Institutional support: RVO:68378271
Keywords : photocurrent spectroscopy * perovskite layers * solar cells
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 8.709, year: 2017

Optical absorptance spectroscopy of polycrystalline CH3NH3PbI3 films usually indicates the presence of a PbI2 phase, either as a preparation residue or due to film degradation, but gives no insight on how this may affect electrical properties. Here, we apply photocurrent spectroscopy to both perovskite solar cells and coplanar-contacted layers at various stages of degradation. In both cases, we find that the presence of a PbI2 phase restricts charge-carrier transport, suggesting that PbI2 encapsulates CH3NH3PbI3 grains. We also find that PbI2 injects holes into the CH3NH3PbI3 grains, increasing the apparent photosensitivity of PbI2.
Permanent Link: http://hdl.handle.net/11104/0281623