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Journal ArticleDOI

Solvent engineering for high-quality perovskite solar cell with an efficiency approaching 20%

Tongyue Wu1, Jihuai Wu1, Yongguang Tu1, Xin He1, Zhang Lan1, Miaoliang Huang1, Jianming Lin1 
15 Oct 2017-Journal of Power Sources (Elsevier)-Vol. 365, pp 1-6
TL;DR: In this paper, a ternary-mixed-solvent method for the growth of high-quality [Cs0.05(MA0.17FA0.95Pb(I0.83)0.3] cation-anion-mixed perovskite films by introducing N-methyl-2-pyrrolidone (NMP) into the precursor mixed solution was developed.
About: This article is published in Journal of Power Sources.The article was published on 2017-10-15. It has received 58 citations till now. The article focuses on the topics: Perovskite solar cell & Perovskite (structure).
Citations
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Journal ArticleDOI
TL;DR: In this paper, a review focusing on various perovskite formation and crystallization routes with respect to processing parameters including the precursor solvent, solvent mixture, temperature, time, formation of solvent led intermediate complex species, doping and humidity are discussed.
Abstract: An organic–inorganic perovskite is comprised of an organic cation (CH3NH3+, FAI, or Cs), a metal cation (Pb2+ or Sn2+) and a halide (I−, Cl−, or Br−) molecule. Precursor salts containing these cations, molecules and halide ions dissolved in solvents are used to prepare perovskite films. Perovskite film formation takes place through the reaction of precursor elements, which is assisted by various processing conditions such as thermal annealing, moisture and solvent treatment. This review focuses on various perovskite formation and crystallization routes with respect to processing parameters including the precursor solvent, solvent mixture, temperature, time, formation of solvent led-intermediate complex species, doping and humidity. Adding water as the dopant to the precursor solvent and exposure to moisture from atmospheric humidity to improve perovskite film quality are also discussed. Processing conditions and crystallization processes are described in correlation with the perovskite film morphology, crystallinity, defects, charge transport and device performance. This article will aim to highlighting recent findings in the selection of solvents in the crystallization of perovskite films, solvent induced intermediate phases, and effects of water in assisting perovskite crystallization for improved film quality and device performance. The review will also present various structural and nanoscale characterization techniques that have been used to probe solvent based intermediate species transformation processes to the perovskite phase and understand the effects in correlation with device performance.

180 citations

Journal ArticleDOI
TL;DR: In this article, the authors comprehensively review the recent progress of flexible perovskite solar cells (FPSCs) and highlight the major breakthroughs of FPSCs made in 2019/2020 for both laboratory and large-scale devices.

140 citations

Journal ArticleDOI
TL;DR: In this article, the authors exploit a vast number of defect engineering approaches aiming to increase the performance and the stability of perovskite solar cells, especially against humidity, continuous illumination, and heat.
Abstract: The surface, interfaces and grain boundaries of a halide perovskite film carry critical tasks in achieving as well as maintaining high solar cell performance due to the inherently defective nature across their regime. Passivating materials and felicitous process engineering approaches have significant ramifications in the resultant perovskite film, and the solar cell's overall macroscale properties as they dictate structural and optoelectronic properties. Herein, we exploit a vast number of defect engineering approaches aiming to increase the performance and the stability of perovskite solar cells, especially against humidity, continuous illumination, and heat. This review begins with the perovskite materials' fundamental structural properties followed by the advances made to induce higher stabilization in perovskite solar cells by fine-tuning materials chemistry design parameters. We continue by summarizing defect passivation strategies based on molecular entities' application, including suitable functional groups that enable sufficient surface, bulk and grain boundary passivation, morphology, and crystallinity control. We also present methods to control the density of defects through the variation of processing conditions, solvent annealing and solvent engineering approaches, gas-assisted deposition methods, and use of self-assembled monolayers, as well as colloidal engineering and coordination surface chemistry. Finally, we give our perspective on how a combined understanding of materials chemistry aspects and passivation mechanisms will further develop high-efficiency and stability perovskite solar cells.

115 citations

Journal ArticleDOI
TL;DR: In this article, rare-earth doped upconversion nanoparticles with core-shell structure are synthesized for enhancing the performance of perovskite solar cells, which can be used as spectral conversion materials.

61 citations

Journal ArticleDOI
Xuping Liu1, Jihuai Wu1, Yuqian Yang1, Tongyue Wu1, Qiyao Guo1 
TL;DR: In this paper, a pyridine additive in the precursor mixed solution was introduced to improve the quality of perovskite layer, which achieved a power conversion efficiency of 1903% while the device without adding reached an efficiency of 1694% at the same experiment conditions.

56 citations

References
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Journal ArticleDOI
TL;DR: Perovskite solar cells exhibit improved photovoltaic parameters with increasing perovskites grain size, resulting in a higher power conversion efficiency and a larger open-circuit voltage.
Abstract: Perovskite solar cells exhibit improved photovoltaic parameters with increasing perovskite grain size. The larger photocurrent is due to the enhanced absorption efficiency for thicker perovskite layers. The larger open-circuit voltage (VOC ) is ascribed to the reduced trap-assisted recombination for the larger grains. As a result, the power conversion efficiency exceeds 19% at best. Further improvement in VOC would be possible if the trap density were reduced.

279 citations

Journal ArticleDOI
TL;DR: An all-solid-state dye-sensitized solar cell with total photoelectric conversion efficiency of 5.64% under AM 1.5 simulated solar light (100 mW/cm2) illumination is achieved.
Abstract: Using poly(N-methyl-4-vinyl-pyridine iodide), N-methyl-pyridine iodide and iodine, a solid polymer electrolyte with conductivity of 6.41 mS/cm is prepared. On the basis of a solid polymer electrolyte, a conducting graphite layer, a KI block layer, and a vacuum assembling technique, we achieve an all-solid-state dye-sensitized solar cell with total photoelectric conversion efficiency of 5.64% under AM 1.5 simulated solar light (100 mW/cm2) illumination.

249 citations

Journal ArticleDOI
TL;DR: This study demonstrates high-performance PeSCs with superior reproducibility by introducing small amounts of N-cyclohexyl-2-pyrrolidone (CHP) as a morphology controller into N,N-dimethylformamide (DMF) through a facile method.
Abstract: Perovskite solar cells (PeSCs) have been considered one of the competitive next generation power sources. To date, light-to-electric conversion efficiencies have rapidly increased to over 10%, and further improvements are expected. However, the poor device reproducibility of PeSCs ascribed to their inhomogeneously covered film morphology has hindered their practical application. Here, we demonstrate high-performance PeSCs with superior reproducibility by introducing small amounts of N-cyclohexyl-2-pyrrolidone (CHP) as a morphology controller into N,N-dimethylformamide (DMF). As a result, highly homogeneous film morphology, similar to that achieved by vacuum-deposition methods, as well as a high PCE of 10% and an extremely small performance deviation within 0.14% were achieved. This study represents a method for realizing efficient and reproducible planar heterojunction (PHJ) PeSCs through morphology control, taking a major step forward in the low-cost and rapid production of PeSCs by solving one of the biggest problems of PHJ perovskite photovoltaic technology through a facile method.

212 citations

Journal ArticleDOI
TL;DR: In this article, a CH 3 NH 3 Cl precursor for antisolvent precipitation at low temperature and fabricated high quality perovskite films with desired morphology, crystallinity and optical properties.

119 citations

Journal ArticleDOI
TL;DR: This unique solvent annealing method presents a new way of controlling the perovskite film quality for highly efficient solar cells with a best efficiency of 18.5%, with a fill factor of 76.5%.
Abstract: While most work carried out to date has focused on the solvent annealing of perovskite, in the present work, we focused on the solvent annealing of lead iodide. Based on the two-step spin-coating method, we designed a screening method to search for an effective solvent annealing process for PbI2. PbI2 films were annealed in diverse solvent atmospheres, including DMF, DMSO, acetone, and isopropanol (IPA). We found that the solvent annealing of PbI2 in the DMF, acetone, and IPA atmospheres resulted in dense PbI2 films, which impeded the complete conversion of PbI2 to CH3NH3PbI3. Surprisingly, employing the DMSO solvent annealing process for PbI2 led to porous PbI2, which facilitated the complete conversion of PbI2 to perovskite with larger grain sizes. Solar cells fabricated using the DMSO solvent annealing process exhibited the best efficiency of 18.5%, with a fill factor of 76.5%. This unique solvent annealing method presents a new way of controlling the perovskite film quality for highly efficient solar cells.

81 citations

Trending Questions (1)
Are perovskite solar cells cheaper?

The research presented here provides a facile, low-cost and highly efficient way for the preparation of perovskite solar cells.