Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy

Chen, Weijian; Gan, Zhixing; Green, Martin A.; Jia, Baohua; Wen, Xiaoming

doi:10.1002/smtd.202000731

Cited by 25 publications

(24 citation statements)

References 162 publications

(294 reference statements)

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“…PL spectroscopy is a powerful tool to investigate surface trap density. [ 49 ] Firstly, steady‐state PL measurements were performed on the four kinds of perovskite films as shown in Figure a–d. Under laser excitation, perovskite films generate holes and electrons.…”

Section: Resultsmentioning

confidence: 99%

Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability

Duan

Yao

et al. 2021

Advanced Science

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Structural defects are ubiquitous for polycrystalline perovskite films, compromising device performance and stability. Herein, a universal method is developed to overcome this issue by incorporating halide perovskite quantum dots (QDs) into perovskite polycrystalline films. CsPbBr3 QDs are deposited on four types of halide perovskite films (CsPbBr3, CsPbIBr2, CsPbBrI2, and MAPbI3) and the interactions are triggered by annealing. The ions in the CsPbBr3 QDs are released into the thin films to passivate defects, and concurrently the hydrophobic ligands of QDs self‐assemble on the film surfaces and grain boundaries to reduce the defect density and enhance the film stability. For all QD‐treated films, PL emission intensity and carrier lifetime are significantly improved, and surface morphology and composition uniformity are also optimized. Furthermore, after the QD treatment, light‐induced phase segregation and degradation in mixed‐halide perovskite films are suppressed, and the efficiency of mixed‐halide CsPbIBr2 solar cells is remarkably improved to over 11% from 8.7%. Overall, this work provides a general approach to achieving high‐quality halide perovskite films with suppressed phase segregation, reduced defects, and enhanced stability for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability

Duan

Yao

et al. 2021

Advanced Science

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“…Vacancy site defects can result in a much faster ion migration at the grain boundary and surface compared with that in the bulk [ 63 , 64 , 65 , 66 ]. Eliminating ion migration paths by passivating bulk and interface defects can effectively inhibit ion migration or diffusion.…”

Section: Psc Interfacementioning

confidence: 99%

Review of Interface Passivation of Perovskite Layer

Wang

Liu

et al. 2021

Nanomaterials

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Perovskite solar cells (PSCs) are the most promising substitute for silicon-based solar cells. However, their power conversion efficiency and stability must be improved. The recombination probability of the photogenerated carriers at each interface in a PSC is much greater than that of the bulk phase. The interface of a perovskite polycrystalline film is considered to be a defect-rich area, which is the main factor limiting the efficiency of a PSC. This review introduces and summarizes practical interface engineering techniques for improving the efficiency and stability of organic–inorganic lead halide PSCs. First, the effect of defects at the interface of the PSCs, the energy level alignment, and the chemical reactions on the efficiency of a PSC are summarized. Subsequently, the latest developments pertaining to a modification of the perovskite layers with different materials are discussed. Finally, the prospect of achieving an efficient PSC with long-term stability through the use of interface engineering is presented.

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“…studies often require the use of advanced characterization methods. Among those, time resolved photoluminescence (TR-PL) is widely used to probe halide perovskites transport properties [10,11]. If the TR-PL experiments are rather easy to perform, difficulties lie in the correct physical interpretation of the signal [12,13].…”

mentioning

confidence: 99%

Mapping Transport Properties of Halide Perovskites via Short-Time-Dynamics Scaling Laws and Subnanosecond-Time-Resolution Imaging

et al. 2021

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The excellent optoelectronic and transport properties of halide perovskites led to a rapid development of perovskite based optoelectronic devices. The fundamental understanding of charge carrier dynamics as well as the implementation of physical models able to accurately describe their behaviour are essential for further improvements in the field. Here, combining advanced modeling and characterization, a method for analyzing the short time dynamics of time resolved fluorescence imaging (TR-FLIM) decays is demonstrated. A theoretical scaling law for the time derivative of transient photoluminescence decays as a function of the excitation power is extracted. This scaling law, computed from classical drift-diffusion equations, defines an innovative and simple way to extract quantitative values for several transport parameters including the external radiative recombination coefficient. The model was notably applied on a set of images acquired with a temporal shift of 250 ps to map the top surface recombination velocity of a triple cation mixed halide perovskite thin film at the microscale. The development of high-time-resolution imaging techniques coupled with the scaling method for analyzing short-time dynamics provides a solid platform for the investigation of local heterogeneities in semiconductor materials and the accurate determination of the main parameters governing their carrier transport. I. INTRODUCTIONOver the last decade, lead-halide perovskites solar cells have proved to be a serious candidate for reaching large scale photovoltaic (PV) solar energy conversion, a much-needed solution to meet climate targets and move towards a low-carbon economy. However, despite this emerging technology has recently reached a record power conversion efficiency of 25.5% for a single junction device [1,2], several open questions persist in the scientific community, ranging from the nature and densities of the defects in the absorbers [3-5], the optimal design for the interfaces energetics in a full device [6,7], and the long term stability [7][8][9].The optimization of device performances goes along with the complete understanding of complex recombination processes occurring both in the bulk and at the interfaces. Due to the interplay of several chemical and physical parameters in these hybrid compounds, such

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Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy

Cited by 25 publications

References 162 publications

Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability

Quantum Dot Passivation of Halide Perovskite Films with Reduced Defects, Suppressed Phase Segregation, and Enhanced Stability

Review of Interface Passivation of Perovskite Layer

Mapping Transport Properties of Halide Perovskites via Short-Time-Dynamics Scaling Laws and Subnanosecond-Time-Resolution Imaging

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