Journal
ACS NANO
Volume 8, Issue 1, Pages 362-373Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn404323g
Keywords
mesoscopic solar cells; perovskite; impedance spectroscopy; spiro-MeOTAD; tert-butylpyridine; LiTFSI
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Funding
- Aisin Cosmos R&D Co., Ltd., Japan
- European Community [NMP-229036]
- European Research Council [ARG 247404]
- Ministry of Education, Science and Technology through the National Research Foundation of Korea [R31-2008-000-10035-0]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R31-2008-000-10035-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Mesoscopic solid-state solar cells based on the inorganic-organic hybrid perovskite CH(3)NH(3)Pbl(3) in conjunction with the amorphous organic semiconductor spiro-MeOTAD as a hole transport material (HIM) are investigated using impedance spectroscopy (IS). A model to interpret the frequency response of these devices is established by expanding and elaborating on the existing models used for the liquid and solid-state dye-sensitized solar cells. Furthermore, the influence of changing the additive concentrations of tert-butylpyridine and LiTFSI in the HIM and varying the HIM overlayer thickness on top of the sub-micrometer thick TiO2 on the extracted IS parameters is investigated. The internal electrical processes of such devices are studied and correlated with the overall device performance. In particular, the features in the IS responses that are attributed to the ionic and electronic transport properties of the perovskite material and manifest as a slow response at low frequency and an additional RC element at intermediate frequency, respectively, are explored.
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