Efficient luminescent solar cells based on tailored mixed-cation perovskites

Bi, Dongqin; Tress, Wolfgang; Dar, M. Ibrahim; Gao, Peng; Luo, Jingshan; Renevier, Clementine; Schenk, Kurt J.; Abate, Antonio; Giordano, Fabrizio; Correa‐Baena, Juan‐Pablo; Décoppet, Jean-David; Zakeeruddin, Shaik M.; Nazeeruddin, Mohammad Khaja; Grätzel, Michaël; Hagfeldt, Anders

doi:10.1126/sciadv.1501170

Cited by 1,760 publications

(1,493 citation statements)

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“…In the reverse scan direction, a 19.5 % PCE was achieved, yielding a J SC of 23.4 mA cm -2 , V OC of 1.12 V, and FF of 0.74. Negligible J-V hysteresis was observed in this type of devices as the PCE obtained from the forward scan (19.2%) was almost the same as that from reverse scan which indicates the successful morphology control and is in agreement with previous studies from our laboratories 19 and others. 4 These results, add more suspense to the origin of hysteresis 31 and preclude the necessity of n-type PCBM to eliminate the hysteresis effect.…”

Section: Resultssupporting

confidence: 91%

“…The dependence of J SC and FF on the PbI 2 content is different from the behavior observed when extra PbI 2 is added to the precursor solution, where no significant change is observed over a large range of PbI 2 excess contents. 19 The PbI 2 generated in-situ at high temperature above 100 o C reduces J SC and FF very quickly. When the film is annealed at 180 o C, prominent PbI 2 phase is observed as indicated by the slight color bleaching and the strong XRD diffraction peak of PbI 2 .…”

Section: Resultsmentioning

confidence: 98%

“…19 In our previous study, we introduced a stoichiometric excess of PbI 2 in our recipe and reported on a subtle correlation between the PbI 2 content of the mixed perovskite and the open circuit voltage (V OC ). On the other hand it is known that the excess of PbI 2 phase can be generated intentionally by controlled thermal annealing of a stoichiometric film.…”

Section: Resultsmentioning

confidence: 99%

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Morphology Engineering: A Route to Highly Reproducible and High Efficiency Perovskite Solar Cells

Luo

Wang

et al. 2017

ChemSusChem

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Despite the rapid increase in the performance of perovskite solar cells, they still suffer from low lab-to-lab or people-to-people reproducibility. Aiming for a universal condition to high performance devices, we investigated the morphology evolution of the composite perovskite by tuning annealing temperature and precursor concentration of the perovskite film. Here we introduce thermal annealing as a powerful tool to generate a well controlled excess of PbI 2 in the perovskite formulation and show that this benefits the photovoltaic performance. We demonstrated the correlation between the film microstructure and electronic property and device performance. An optimized average grain size/thickness aspect ratio of the perovskite crystallite is identified, which brings about a highly 2 reproducible power conversion efficiency (PCE) of 19.5%, with a certified value of 19.08%.Negligible hysteresis and outstanding morphology stability are observed with these devices. These findings lay the foundation for further boosting the PCE of PSC and can be very instructive in fabrication high quality perovskite films for a variety of applications, such as light-emitting diodes, field-effect transistors and photo-detectors, etc.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Morphology Engineering: A Route to Highly Reproducible and High Efficiency Perovskite Solar Cells

Luo

Wang

et al. 2017

ChemSusChem

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“…[4,40] The latest records that have surpassed the 20% PCE barrier followed an approach using a mixture of solvents (4:1 DMF:DMSO, which would result in a molar ratio between DMSO:PbI 2 of ≈2:1) and the CB antisolvent method, while mixing three to four different cations and two halides. [4,41] The impact of solvents on the perovskite film morphology was further investigated by post-deposition solvent annealing. [23] …”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Petrus

Schlipf

Cheng

et al. 2017

Advanced Energy Materials

317

201

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following statement: These materials can be processed from solution and yet exhibit optoelectronic materials properties described in classic solid-state physics textbooks. This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.The road towards these achievements has been marked by a constant improvement of perovskite deposition techniques fueled by our increasing understanding of the crystallization processes. The choice of deposition technique, either from solution or vapor, and the composition and order in which precursor species are applied has a great influence on the crystallization kinetics. Here, one can distinguish one-step methods where the perovskite is formed from a precursor mixture dissolved in a common solution, and two-step methods where the inorganic compound is deposited first and transformed to the perovskite phase later by addition of the organic constituents. [9][10][11] Furthermore, many parameters during processing can have an effect on the crystallization mechanism and consequently on film morphology, such as the choice of solvents, concentrations and processing additives that are often not incorporated into the final product. [11][12][13] We discuss this aspect in Section 2, where we focus our attention on the most commonly employed solution-based techniques. Additionally, as for any new technology trying to displace an incumbent technology, higher efficiencies, lower costs, reproducibility, stability, and sustainability are paramount. In particular, reproducibility has been a major challenge in perovskite solar cells from the beginning: small variations in morphology, like crystal size, film roughness, and pinholes can have detrimental effects on photovoltaic performance. [14] On the other hand, current-voltage measurements often showed a hysteresis that is rarely seen in other photovoltaic technologies. [15] These topics are highlighted in Sections 3 and 4. Finally, in Section 5 we discuss the framework for market introduction, such as cost reduction by choosing low-cost charge transport layers, or how the lifetime of perovskite absorbers can be extended by the choice of materials composition.Hybrid metal halide perovskites have become one of the hottest topics in optoelectronic materials research in recent years. Not only have they surpassed everyone's expectations and achieved similar performance as tried and true polycrystalline silicon photovoltaic devices, but they are also finding applications in a variety of different fields, including lighting. The main advantages of hybrid metal halide perovskites are simple processability, compatible with large-scale solution processing such as roll-to-roll printing, a...

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“…Since the first attempt using perovskite as light absorber in photovoltaic cells,2 tremendous progress has been made on PSCs with a certified power conversion efficiency (PCE) exceeding 20% 3. The impressive efficiency of PSCs is mostly attributed to merits of perovskite, such as broad absorption with large absorption coefficient, ambipolar charge transport with high mobility, as well as long electron/hole diffusion length.…”

Section: Introductionmentioning

confidence: 99%

High‐Mobility p‐Type Organic Semiconducting Interlayer Enhancing Efficiency and Stability of Perovskite Solar Cells

Zhang

Wang

et al. 2017

Advanced Science

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A high‐mobility p‐type organic semiconductor based on benzodithiophene and diketopyrrolopyrrole with linear alkylthio substituents (BDTS‐2DPP) is used as a dual function interfacial layer to modify the interface of perovskite/2,2′,7,7′‐tetrakis(N,N′‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene in planar perovskite solar cells. The BDTS‐2DPP layer can remarkably passivate the surface defects of perovskite through the formation of Lewis adduct between the under‐coordinated Pb atoms in perovskite and S atoms in BDTS‐2DPP, and also shows efficient hole extraction and transfer properties. The devices with BDTS‐2DPP interlayer show a peak power conversion efficiency of 18.2%, which is higher than that of reference devices without the BDTS‐2DPP interlayer (16.9%). Moreover, the hydrophobic BDTS‐2DPP interlayer effectively protects the perovskite against moisture, leading to enhanced device stability.

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Efficient luminescent solar cells based on tailored mixed-cation perovskites

Abstract: Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%).

Cited by 1,760 publications

References 31 publications

Morphology Engineering: A Route to Highly Reproducible and High Efficiency Perovskite Solar Cells

Morphology Engineering: A Route to Highly Reproducible and High Efficiency Perovskite Solar Cells

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

High‐Mobility p‐Type Organic Semiconducting Interlayer Enhancing Efficiency and Stability of Perovskite Solar Cells

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