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- Title
Boosting the Efficiency of Perovskite Solar Cells with CsBr‐Modified Mesoporous TiO<sub>2</sub> Beads as Electron‐Selective Contact.
- Authors
Seo, Ji‐youn; Uchida, Ryusuke; Kim, Hui‐seon; Saygili, Yasemin; Luo, Jingshan; Moore, Chris; Kerrod, Julie; Wagstaff, Anthony; Eklund, Mike; Mcintyre, Robert; Pellet, Norman; Zakeeruddin, Shaik M.; Hagfeldt, Anders; Grätzel, Michael
- Abstract
Abstract: Rapid extraction of photogenerated charge carriers is essential to achieve high efficiencies with perovskite solar cells (PSCs). Here, a new mesoscopic architecture as electron‐selective contact for PSCs featuring 40 nm sized TiO2 beads endowed with mesopores of a few nanometer diameters is introduced. The bimodal pore distribution inherent to these films produces a very large contact area of 200 m2 g−1 whose access by the perovskite light absorber is facilitated by the interstitial voids between the particles. Modification of the TiO2 surface by CsBr further strengthens its interaction with the perovskite. As a result, photogenerated electrons are extracted rapidly producing a very high fill factor of close to 80% a <italic>V</italic>OC of 1.14 V and a PCE up to 21% with negligible hysteresis.
- Subjects
PEROVSKITE analysis; SOLAR cell efficiency; MESOPOROUS materials; TITANIUM oxides; BEADS
- Publication
Advanced Functional Materials, 2018, Vol 28, Issue 15, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201705763