| 1. |
- Leijtens, Tomas, et al.
(författare)
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Electronic Properties of Meso-Superstructured and Planar Organometal Halide Perovskite Films : Charge Trapping, Photodoping, and Carrier Mobility
- 2014
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Ingår i: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 8:7, s. 7147-7155
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Tidskriftsartikel (refereegranskat)abstract
- Solution-processed organometal trihalide perovskite solar cells are attracting increasing interest, leading to high performances over 15% in thin film architectures. Here, we probe the presence of sub gap states in both solid and mesosuperstructured perovskite films and determine that they strongly influence the photoconductivity response and splitting of the quasi-Fermi levels in films and solar cells. We find that while the planar perovskite films are superior to the mesosuperstructured films in terms of charge carrier mobility (in excess of 20 cm(2) V-1 s(-1)) and emissivity, the planar heterojunction solar cells are limited in photovoltage by the presence of sub gap states and low intrinsic doping densities.
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| 2. |
- Zhang, Xiaoliang, et al.
(författare)
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Semitransparent quantum dot solar cell
- 2016
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Ingår i: Nano Energy. - : Elsevier BV. - 2211-2855. ; 22, s. 70-78
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Forskningsöversikt (refereegranskat)abstract
- Semitransparent solar cells can open new applications in many areas, such as integration into buildings, and may also be important for construction of efficient multi-junction solar cells. Herein, we report for the first time a semitransparent quantum dot (QD) solar cell using a thin PbS QD film as light absorber and a transparent Au film as back contact. The QD film has a strong light absorption close to ultraviolet (UV) region and a peak in absorption in the near infrared (IR) region, and the solar cell can thereby be rather transparent in the visible region. The solar cell shows a power conversion efficiency of 3.9% with a peak transmission of ~37% at ~770 nm, and an average visible transmittance of ~22%. Furthermore, when illuminated from the Au back contact side, the solar cell maintains its good performance. These promising results for semitransparent QD solar cells and the possibility for changes in the light absorption spectrum by size variation of the QD show the potential toward integration into buildings or automobiles, or for use in tandem or multi-junction solar cells.
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