Precisely Controlled Hydration Water for Performance Improvement of Organic–Inorganic Perovskite Solar Cells

Li, Ling; Yuan, Sijian; Wang, Pengfei; Zhang, Huotian; Tu, Li; Wang, Jiao; Zhan, Yiqiang; Zheng, Lirong

doi:10.1002/adfm.201601557

Cited by 70 publications

(59 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[21][22][23][24][25][26][27] The second recipe is based on the solvent engineering technique introduced by Jeon et al in 2014. The first recipe is based on a lead acetate trihydrate (PbAc 2 ·3H 2 O) precursor and has attracted significant attention for application in inverted architecture solar cells since its introduction by Zhang and co-workers.…”

Section: Photovoltaic Performancementioning

confidence: 99%

“…[31][32][33] Conversely, the SEM cross-section of the sol-eng film shows that the film consists of multiple grains which are larger at the interface with PEDOT:PSS and smaller at the film surface. [23,26,47] Choosing these two recipes allows us to compare the rate of oxygen induced degradation of perovskite films with few defects and large grains protruding throughout the film thickness to that of a film with higher defect density and small and irregular grains. Recently, it has been shown that reduced PL originates from recombination centers located mainly at the surface and grain boundaries of the perovskite crystals.…”

Section: Photovoltaic Performancementioning

confidence: 99%

See 1 more Smart Citation

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Sun

Faßl

Becker‐Koch

et al. 2017

Advanced Energy Materials

205

210

View full text Add to dashboard Cite

photovoltaic technology, where lifetimes greater than 25 years are required. [2] Although the issue of device stability has attracted increased attention of the photovoltaic research community in the last two years, reports that systematically study the fundamental causes (e.g., heat, electrical stress, humidity, oxygen, (UV) light, chemical precursors, processing conditions, influence of film quality and morphology) and mechanisms limiting the material and device stability remain scarce. [2][3][4][5] While the degradation of methylammonium lead iodide (MAPbI 3 ) in humid air has been studied experimentally as well as theoretically and was long thought to be the main factor for material degradation in ambient environment, [6][7][8][9][10][11][12][13][14][15] studies exploring the influence of oxygen and light on the solar cell performance have only recently been reported. [16][17][18][19][20] It has been shown that photoexcited electrons in the perovskite layer can form superoxide (O 2 − ) via electron transfer to molecular oxygen, which through deprotonation of the methylammonium cation in turn results in irreversible material degradation. The severity of the degradation has been linked to the efficiency of electron extraction via the electron extracting layer (EEL): devices employing a compact-TiO 2 /mesoporous Al 2 O 3 or compact-TiO 2 as EELs degraded in dry air on a timescale of less than 1 h, while with the use of a mesoporous TiO 2 layer, an EEL which results in faster electron extraction, the lifetimes were significantly increased. However, in these reports only the degradation of complete photovoltaic device was reported, with limited information on the degradation of the perovskite active layer itself and the impact of its microstructure was not identified.In this work, we systematically study the degradation of MAPbI 3 films under precisely controlled exposure to various oxygen levels (0-20%) under simulated sunlight in order to shed light on the progression of perovskite degradation under these conditions. We investigate two types of perovskite layers that are formed using different fabrication methods. The two recipes allow us to include the effect of layer microstructure on the dynamics of oxygen-induced degradation. We characterize the electronic, optical, compositional, and structural properties of the degraded perovskite films and correlate these results This paper investigates the impact of microstructure on the degradation rate of methylammonium lead triiodide (MAPbI 3 ) perovskite films upon exposure to light and oxygen. By comparing the oxygen induced degradation of perovskite films of different microstructure-fabricated using either a lead acetate trihydrate precursor or a solvent engineering technique-it is demonstrated that films with larger and more uniform grains and better electronic quality show a significantly reduced degradation compared to films with smaller, more irregular grains. The effect of degradation on the optical, compositional, and microstructural properties of the perovsk...

show abstract

Section: Photovoltaic Performancementioning

confidence: 99%

Section: Photovoltaic Performancementioning

confidence: 99%

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Sun

Faßl

Becker‐Koch

et al. 2017

Advanced Energy Materials

205

210

View full text Add to dashboard Cite

show abstract

“…The authors found an optimum by using PbAc 2 × 1.5H 2 O, which resulted in the highest PCEs. [44] Several studies already showed that exposure of the films to ambient conditions can have a positive effect on perovskite film formation, [45] i.e., it was shown to trigger the crystallization [46] or partly dissolve the reactant species and accelerate mass transport within the film. [3] In a recent study, Giesbrecht et al used lead acetate as the precursor for the crystallization of methylammonium lead bromide (MAPbBr 3 ) perovskite films.…”

Section: Crystallization From Lead-acetate Precursorsmentioning

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

312

201

View full text Add to dashboard Cite

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...

show abstract

“…[11][12][13] Among the previous research works, hybrid lead halide perovskites have been used in many fields, such as solar cells, 1,2,5,8,9,14 light-emitting diodes, [15][16][17][18][19] sensitive photodetectors, [20][21][22] and lasers. 4,23,24 It is necessary to mention about the photovoltaic applications, which is a very hot research topic recently, that the latest reported power conversion efficiency has been increased remarkably from the original 3.8% (Ref.…”

mentioning

confidence: 99%

Reversible air-induced optical and electrical modulation of methylammonium lead bromide (MAPbBr3) single crystals

Zhang

Liu

et al. 2017

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

The photoluminescence (PL) variations of organic-inorganic hybrid lead halide perovskites in different atmospheres are well documented, while the fundamental mechanism still lacks comprehensive understandings. This study reports the reversible optical and electrical properties of methylammonium lead bromide (MAPbBr3 or CH3NH3PbBr3) single crystals caused by air infiltration. With the change in the surrounding atmosphere from air to vacuum, the PL intensity of perovskite single crystals decreases, while the conductivity increases. By means of first-principles computational studies, the shallow trap states are considered as key elements in PL and conductivity changes. These results have important implications for the characterization and application of organic-inorganic hybrid lead halide perovskites in vacuum.

show abstract

Precisely Controlled Hydration Water for Performance Improvement of Organic–Inorganic Perovskite Solar Cells

Cited by 70 publications

References 29 publications

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

Role of Microstructure in Oxygen Induced Photodegradation of Methylammonium Lead Triiodide Perovskite Films

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

Reversible air-induced optical and electrical modulation of methylammonium lead bromide (MAPbBr3) single crystals

Contact Info

Product

Resources

About