Large-Grain Double Cation Perovskites with 18 μs Lifetime and High Luminescence Yield for Efficient Inverted Perovskite Solar Cells

Gutierrez‐Partida, Emilio; Hempel, Hannes; Caicedo‐Dávila, Sebastián; Raoufi, Meysam; Peña‐Camargo, Francisco; Grischek, Max; Gunder, René; Diekmann, Jonas; Caprioglio, Pietro; Brinkmann, Kai Oliver; Köbler, Hans; Albrecht, Steve; Riedl, Thomas; Abate, Antonio; Abou‐Ras, Daniel; Unold, Thomas; Neher, Dieter; Stolterfoht, Martin

doi:10.1021/acsenergylett.0c02642

Cited by 56 publications

(59 citation statements)

References 48 publications

(111 reference statements)

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“…We repeat this experiment on a double cation (DC) perovskite (FA 0.8 MA 0.2 PbI 3 with a bandgap of 1.54 eV and cells with a PCE of around 21%, performance parameters, Figure S1, Supporting Information) which we recently reported to have a PLQY in neat films of up to 0.2 and a Shockley‐Read‐Hall (SRH) lifetime over 10 µs. [ 14 ] This will afford us a larger dynamic range to investigate PLQY losses (Figure 3a). In this case, we find the same result where almost all loss occurred in the first nm, and, the loss is very large (5 × 10 −3 after 1 nm).…”

Section: Location Of Nonradiative Recombinationmentioning

confidence: 99%

Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

Warby

Zeiske

et al. 2022

Advanced Energy Materials

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112

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perovskite device allowing us to rule out this mechanism. We conclude that recombination across the interface via C 60 trap states is the operational mechanism and that the traps originate either from charge transfer states or DOS broadening at the interface pinning the LUMO below the conduction band of the perovskite. The investigation laid out here and proof of concept devices demonstrates that reducing the hole concentration at the perovskite C 60 interface and "point contact" strategies will allow one to improve the device V OC , paving the way for further strategies to eliminate this loss pathway.

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Section: Location Of Nonradiative Recombinationmentioning

confidence: 99%

Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

Warby

Zeiske

et al. 2022

Advanced Energy Materials

Self Cite

112

149

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“…[66] Substituting the perovskite material with a large-grain double cation perovskite led to a similar increase from 0.79 to 0.83. [67] However, due to the large number of material properties that determine the JV-curve, the measured curve can also be reproduced with other combinations of parameters. For instance, band offset, ion diffusion, or shunts can affect the fill factor.…”

Section: Transport Losses In Jv-curvesmentioning

confidence: 99%

Predicting Solar Cell Performance from Terahertz and Microwave Spectroscopy

Hempel

Savenjie

Stolterfoht

et al. 2022

Advanced Energy Materials

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Mobilities and lifetimes of photogenerated charge carriers are core properties of photovoltaic materials and can both be characterized by contactless terahertz or microwave measurements. Here, the expertise from fifteen laboratories is combined to quantitatively model the current‐voltage characteristics of a solar cell from such measurements. To this end, the impact of measurement conditions, alternate interpretations, and experimental inter‐laboratory variations are discussed using a (Cs,FA,MA)Pb(I,Br)3 halide perovskite thin‐film as a case study. At 1 sun equivalent excitation, neither transport nor recombination is significantly affected by exciton formation or trapping. Terahertz, microwave, and photoluminescence transients for the neat material yield consistent effective lifetimes implying a resistance‐free JV‐curve with a potential power conversion efficiency of 24.6 %. For grainsizes above ≈20 nm, intra‐grain charge transport is characterized by terahertz sum mobilities of ≈32 cm2 V−1 s−1. Drift‐diffusion simulations indicate that these intra‐grain mobilities can slightly reduce the fill factor of perovskite solar cells to 0.82, in accordance with the best‐realized devices in the literature. Beyond perovskites, this work can guide a highly predictive characterization of any emerging semiconductor for photovoltaic or photoelectrochemical energy conversion. A best practice for the interpretation of terahertz and microwave measurements on photovoltaic materials is presented.

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“…When the temperature was increased to 45 °C, the average crystal size dropped quickly to 272 nm. The perovskite thin films were demonstrated to have various grain sizes [ 35 , 36 ], which were associated with different crystal growth dynamics and growth techniques. The effect of grain size on photovoltaic performance was studied.…”

Section: Resultsmentioning

confidence: 99%

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

Liu

Zhang

et al. 2021

Molecules

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Inorganic cesium lead halide perovskites, as alternative light absorbers for organic–inorganic hybrid perovskite solar cells, have attracted more and more attention due to their superb thermal stability for photovoltaic applications. However, the humid air instability of CsPbI2Br perovskite solar cells (PSCs) hinders their further development. The optoelectronic properties of CsPbI2Br films are closely related to the quality of films, so preparing high-quality perovskite films is crucial for fabricating high-performance PSCs. For the first time, we demonstrate that the regulation of ambient temperature of the dry air in the glovebox is able to control the growth of CsPbI2Br crystals and further optimize the morphology of CsPbI2Br film. Through controlling the ambient air temperature assisted crystallization, high-quality CsPbI2Br films are obtained, with advantages such as larger crystalline grains, negligible crystal boundaries, absence of pinholes, lower defect density, and faster carrier mobility. Accordingly, the PSCs based on as-prepared CsPbI2Br film achieve a power conversion efficiency of 15.5% (the maximum stabilized power output of 15.02%). Moreover, the optimized CsPbI2Br films show excellent robustness against moisture and oxygen and maintain the photovoltaic dark phase after 3 h aging in an air atmosphere at room temperature and 35% relative humidity (R.H.). In comparison, the pristine films are completely converted to the yellow phase in 1.5 h.

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Large-Grain Double Cation Perovskites with 18 μs Lifetime and High Luminescence Yield for Efficient Inverted Perovskite Solar Cells

Cited by 56 publications

References 48 publications

Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

Predicting Solar Cell Performance from Terahertz and Microwave Spectroscopy

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

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