Unusual defect physics in CH3NH3PbI3 perovskite solar cell absorber

Yin, Wan‐Jian; Shi, Tingting; Yan, Yanfa

doi:10.1063/1.4864778

Cited by 2,387 publications

(2,573 citation statements)

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“…The furnace was preheated to 360 °C in zone 1 and 350 °C in zone 2. The substrates were loaded into the furnace in zone 2, but close to zone 1, and 300 mg BiI 3 was deposited on top by spin-casting a solution of 1 mol L −1 nickel nitrate hexahydrate (Sigma-Aldrich) in ethylene glycol with 1 mol L −1 ethylenediamine at 5000 rpm for 45 s. The films were annealed in air at 100 °C for 40 min, followed by 300 °C for 1 h. Following BiOI deposition on top, ZnO was deposited by AP-CVD. Diethylzinc (Sigma-Aldrich) was used as the Zn precursor, and 100 mL min −1 oxygen gas (Air Products, <3 ppm H 2 O) as the oxidant.…”

Section: Methodsmentioning

confidence: 99%

“…[5,9,[11][12][13] Timecorrelated single photon counting (TCSPC) measurements of (CH 3 NH 3 ) 3 Bi 2 I 9 and Cs 2 AgBiBr 6 , among others, have shown that these materials exhibit lifetimes exceeding 1 ns. [11,15,16] This is significant because analysis of established thin-film solar absorbers has shown that materials with minority-carrier lifetimes of 1 ns or above have the potential to reach or exceed 10% efficiency.…”

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confidence: 99%

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Strongly Enhanced Photovoltaic Performance and Defect Physics of Air‐Stable Bismuth Oxyiodide (BiOI)

et al. 2017

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Bismuth‐based compounds have recently gained increasing attention as potentially nontoxic and defect‐tolerant solar absorbers. However, many of the new materials recently investigated show limited photovoltaic performance. Herein, one such compound is explored in detail through theory and experiment: bismuth oxyiodide (BiOI). BiOI thin films are grown by chemical vapor transport and found to maintain the same tetragonal phase in ambient air for at least 197 d. The computations suggest BiOI to be tolerant to antisite and vacancy defects. All‐inorganic solar cells (ITO|NiOx|BiOI|ZnO|Al) with negligible hysteresis and up to 80% external quantum efficiency under select monochromatic excitation are demonstrated. The short‐circuit current densities and power conversion efficiencies under AM 1.5G illumination are nearly double those of previously reported BiOI solar cells, as well as other bismuth halide and chalcohalide photovoltaics recently explored by many groups. Through a detailed loss analysis using optical characterization, photoemission spectroscopy, and device modeling, direction for future improvements in efficiency is provided. This work demonstrates that BiOI, previously considered to be a poor photocatalyst, is promising for photovoltaics.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Strongly Enhanced Photovoltaic Performance and Defect Physics of Air‐Stable Bismuth Oxyiodide (BiOI)

et al. 2017

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“…The latter would be responsible for nonradiative recombination acting as Shockley-Read-Hall nonradiative recombination centers. [147] This explains the origin of the excellent defect tolerance of these perovskite materials.…”

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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“…11,12 Distortions of the inorganic lattice by halide substitution and octahedral tilting have been shown to influence the band gap and absorption properties. 7,[13][14][15] Although the A-cation does not contribute to electronic states near the band gap, [16][17][18] it has been shown to affect the nature of the band gap through interaction with the inorganic Pb−I sublattice. 19 Moreover, the dielectric properties of CH 3 NH 3 PbI 3 are linked to both the rotational dynamics and ordering of the molecular A-cation and the structural phase transitions of the inorganic Pb−I lattice.…”

Section: Introductionmentioning

confidence: 99%

Energy Landscape of Molecular Motion in Cubic Methylammonium Lead Iodide from First-Principles

2016

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Molecular A-cation dynamics are known to play a role in the electronic properties and structure of hybrid organic-inorganic ABX 3 perovskites such as CH 3 NH 3 PbI 3 .We calculate the full energy landscape for rigid-body rotations and translations of the methylammonium cation in the cubic phase of CH 3 NH 3 PbI 3 . Energy barriers are calculated for combinations of molecular reorientation, on-axis rotation, and molecular translation within the unit cell. Allowing molecular translations significantly stabilizes orientations along [100] which we attribute to strong N−H· · · I interactions between CH 3 NH 3 + and the inorganic Pb−I host lattice.

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Unusual defect physics in CH3NH3PbI3 perovskite solar cell absorber

Cited by 2,387 publications

References 24 publications

Strongly Enhanced Photovoltaic Performance and Defect Physics of Air‐Stable Bismuth Oxyiodide (BiOI)

Strongly Enhanced Photovoltaic Performance and Defect Physics of Air‐Stable Bismuth Oxyiodide (BiOI)

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

Energy Landscape of Molecular Motion in Cubic Methylammonium Lead Iodide from First-Principles

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