Enabling Flexible All-Perovskite Tandem Solar Cells

Palmstrom, Axel F.; Eperon, Giles E.; Leijtens, Tomas; Prasanna, Rohit; Habisreutinger, Severin N.; Nemeth, William; Gaulding, E. Ashley; Dunfield, Sean P.; Reese, Matthew O.; Nanayakkara, Sanjini U.; Moot, Taylor; Werner, Jérémie; Li, Jun; To, Bobby; Christensen, Steven T.; McGehee, Michael D.; Hest, Maikel F.A.M. van; Luther, Joseph M.; Berry, Joseph J.; Moore, David T.

doi:10.1016/j.joule.2019.05.009

Cited by 394 publications

(481 citation statements)

References 38 publications

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“…CsPbI 3 solar cells made without the use of any additional organic additives have reached a champion efficiency of 15.7% and a recent report of 14.1%, although with organic additives efficiencies of 18.4% have been reported, but the latter are no longer all‐inorganic CsPbI 3 devices . MeOAc has recently been reported as an effective antisolvent for DMA 0.1 FA 0.6 Cs 0.3 Pb(I 0.8 Br 0.2 ) 3 yielding device efficiencies of 19.2%, suggesting that MeOAc can be effectively used in other Cs‐rich perovskites . EtOAc devices reach the second highest PCE of 13.2% although the average was only 9.84% due to large variations in performance influenced by the solvent glovebox atmosphere (Figure 5B and Figures S7 and S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…High‐efficiency perovskite solar cells utilizing the triple cation formulation have been shown to have PCE exceeding 20%, low radiative loss, and stability for thousands of hours under certain stressing conditions . CsI is incorporated to improve both film quality and stability, often through minimizing I/Br halide phase segregation under illumination, which is critical for use in high‐performance perovskite tandems . The precursor solutions to create such films contain many salts that may interact in various ways.…”

Section: Introductionmentioning

confidence: 99%

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CsI‐Antisolvent Adduct Formation in All‐Inorganic Metal Halide Perovskites

Moot

Marshall

Wheeler

et al. 2020

Advanced Energy Materials

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The excellent optoelectronic properties demonstrated by hybrid organic/inorganic metal halide perovskites are all predicated on precisely controlling the exact nucleation and crystallization dynamics that occur during film formation. In general, high‐performance thin films are obtained by a method commonly called solvent engineering (or antisolvent quench) processing. The solvent engineering method removes excess solvent, but importantly leaves behind solvent that forms chemical adducts with the lead‐halide precursor salts. These adduct‐based precursor phases control nucleation and the growth of the polycrystalline domains. There has not yet been a comprehensive study comparing the various antisolvents used in different perovskite compositions containing cesium. In addition, there have been no reports of solvent engineering for high efficiency in all‐inorganic perovskites such as CsPbI3. In this work, inorganic perovskite composition CsPbI3 is specifically targeted and unique adducts formed between CsI and precursor solvents and antisolvents are found that have not been observed for other A‐site cation salts. These CsI adducts control nucleation more so than the PbI2–dimethyl sulfoxide (DMSO) adduct and demonstrate how the A‐site plays a significant role in crystallization. The use of methyl acetate (MeOAc) in this solvent engineering approach dictates crystallization through the formation of a CsI–MeOAc adduct and results in solar cells with a power conversion efficiency of 14.4%.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CsI‐Antisolvent Adduct Formation in All‐Inorganic Metal Halide Perovskites

Moot

Marshall

Wheeler

et al. 2020

Advanced Energy Materials

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“…The corresponding Sn–Pb PSCs typically have a limited operating lifetime. In contrast, FA and cesium (Cs) based Sn–Pb PSCs have exhibited excellent thermal and over 500‐hour operating stability, but their PCE (single junction < 17%) has curtailed tandems based on this approach 15,16…”

Section: Photovoltaic Performance Of Two‐terminal (2t) All‐perovskitementioning

confidence: 99%

Combining Efficiency and Stability in Mixed Tin–Lead Perovskite Solar Cells by Capping Grains with an Ultrathin 2D Layer

et al. 2020

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The development of narrow‐bandgap (Eg ≈ 1.2 eV) mixed tin–lead (Sn–Pb) halide perovskites enables all‐perovskite tandem solar cells. Whereas pure‐lead halide perovskite solar cells (PSCs) have advanced simultaneously in efficiency and stability, achieving this crucial combination remains a challenge in Sn–Pb PSCs. Here, Sn–Pb perovskite grains are anchored with ultrathin layered perovskites to overcome the efficiency‐stability tradeoff. Defect passivation is achieved both on the perovskite film surface and at grain boundaries, an approach implemented by directly introducing phenethylammonium ligands in the antisolvent. This improves device operational stability and also avoids the excess formation of layered perovskites that would otherwise hinder charge transport. Sn–Pb PSCs with fill factors of 79% and a certified power conversion efficiency (PCE) of 18.95% are reported—among the highest for Sn–Pb PSCs. Using this approach, a 200‐fold enhancement in device operating lifetime is achieved relative to the nonpassivated Sn–Pb PSCs under full AM1.5G illumination, and a 200 h diurnal operating time without efficiency drop is achieved under filtered AM1.5G illumination.

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“…Inorganic NiO x shows merits of being a candidate for stable and well‐performing flexible devices. What is worth mentioning again is the realization of 21.3% PCE flexible all‐perovskite tandem solar cells by Moore's group, which opened doors for design of highly efficient flexible devices.…”

Section: Discussionmentioning

confidence: 99%

“…An early attempt of tandem FPSCs was proposed to develop a 4 T polycrystalline flexible perovskite/CIGS tandem device, yielding an efficiency of 18.2% . Very recently, Moore's group delivered 2 T all‐perovskite flexible tandem solar cells and pushed the efficiency up to 21.3% by incorporating an ALD‐processed recombination layer . The final device was based on the inverted structure and an elaborate design of perovskite bandgaps.…”

Section: Challenges In Fabricating Fpscsmentioning

confidence: 99%

Recent Advances of Device Components toward Efficient Flexible Perovskite Solar Cells

2020

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Flexible solar cells have launched potential applications in diverse areas, such as civil engineering, consumer electronics, electric automobile, and aerospace use. In recent years, perovskite solar cells (PSCs) have been successful with a rocketing power conversion efficiency (PCE) from 3.8% to 25.2% in the last decade. Due to its material flexibility, together with low‐cost and facile fabrication processes, perovskites have certainly been considered as a promising candidate for the next generation of flexible solar cells. So far, the PCE of single‐junction flexible perovskite solar cells (FPSCs) has reached 19.51%, which retains researchers' great enthusiasm for further development and applications of FPSCs. Herein, a brief review of the recent advances in the structural components of FPSCs is presented, including perovskite absorber layers, flexible substrates, transparent bottom electrodes, and charge carrier transport layers. In particular, the focus is on the development of low‐temperature fabrication processes of the aforementioned compositional layer structures. Finally, noticeable achievements and annual milestones are discussed and summarized, and suggestions for further improvement of FPSCs and their ways toward commercialization are presented.

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Enabling Flexible All-Perovskite Tandem Solar Cells

Cited by 394 publications

References 38 publications

CsI‐Antisolvent Adduct Formation in All‐Inorganic Metal Halide Perovskites

CsI‐Antisolvent Adduct Formation in All‐Inorganic Metal Halide Perovskites

Combining Efficiency and Stability in Mixed Tin–Lead Perovskite Solar Cells by Capping Grains with an Ultrathin 2D Layer

Recent Advances of Device Components toward Efficient Flexible Perovskite Solar Cells

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