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Formation of High-Performance Multi-Cation Halide Perovskites Photovoltaics by delta-CsPbI3/delta-RbPbI3 Seed-Assisted Heterogeneous Nucleation
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- Alharbi, Essa A. (författare)
- Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, Inst Chem Sci & Engn, Sch Basic Sci, CH-1015 Lausanne, Switzerland.
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- Baumeler, Thomas P. (författare)
- Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, Inst Chem Sci & Engn, Sch Basic Sci, CH-1015 Lausanne, Switzerland.
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- Krishna, Anurag (författare)
- Ecole Polytech Fed Lausanne, Lab Photomol Sci, Inst Chem Sci & Engn, Sch Basic Sci, CH-1015 Lausanne, Switzerland.
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- Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, Inst Chem Sci & Engn, Sch Basic Sci, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Lab Photomol Sci, Inst Chem Sci & Engn, Sch Basic Sci, CH-1015 Lausanne, Switzerland. (creator_code:org_t)
- 2021-03-15
- 2021
- Engelska.
- Ingår i: Advanced Energy Materials. - : John Wiley & Sons. - 1614-6832 .- 1614-6840. ; 11:16
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling the growth mechanism of perovskite crystals is a promising way towards increasing their efficiency and stability. Herein, a multi-cation halide composition of perovskite solar cells is engineered via the two-step sequential deposition method. Strikingly, it is found that adding mixtures of 1D polymorphs of orthorhombic delta-RbPbI3 and delta-CsPbI3 to the PbI2 precursor solution induces the formation of porous mesostructured hexagonal films. This porosity greatly facilitates the heterogeneous nucleation and the penetration of FA (formamidinium)/MA (methylammonium) cations within the PbI2 film. Thus, the subsequent conversion of PbI2 into the desired multication cubic alpha-structure by exposing it to a solution of formamidinium methylammonium halides is greatly enhanced. During the conversion step, the delta-CsPbI3 also is fully integrated into the 3D mixed cation perovskite lattice, which exhibits high crystallinity and superior optoelectronic properties. The champion device shows a power conversion efficiency (PCE) over 22%. Furthermore, these devices exhibit enhanced operational stability, with the best device retaining more than 90% of its initial value of PCE under 1 Sun illumination with maximum power point tracking for 400 h.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- compositional engineering
- Perovskite solar cells
- stability
- two step methods
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