Do grain boundaries dominate non-radiative recombination in CH3NH3PbI3perovskite thin films?

Yang, Mengjin; Zeng, Yining; Li, Zhen; Kim, Dong Hoe; Jiang, C.-S.; Lagemaat, Jao van de; Zhu, Kai

doi:10.1039/c6cp08770a

Cited by 168 publications

(189 citation statements)

References 33 publications

Supporting

Mentioning

180

Contrasting

Order By: Relevance

“…As a result, the grain size and compactness of the MAPbI 3 film are improved after solvent annealing, which is consisted with the film morphology. Compact films with larger grain sizes decrease the number of grain boundaries and density of defects, which are favorable to improve the photovoltaic performance . In addition, ZnO nanorods passivated with a thin Al 2 O 3 layer improve charge collection in the PSCs, which is confirmed by the transient PL spectra of different perovskite films and J – V curves shown in Figure k,l.…”

Section: Pscs With Zno Nanorods Etmsmentioning

confidence: 63%

Perovskite Solar Cells with ZnO Electron‐Transporting Materials

et al. 2017

View full text Add to dashboard Cite

Perovskite solar cells (PSCs) have developed rapidly over the past few years, and the power conversion efficiency of PSCs has exceeded 20%. Such high performance can be attributed to the unique properties of perovskite materials, such as high absorption over the visible range and long diffusion length. Due to the different diffusion lengths of holes and electrons, electron transporting materials (ETMs) used in PSCs play a critical role in PSCs performance. As an alternative to TiO ETM, ZnO materials have similar physical properties to TiO but with much higher electron mobility. In addition, there are many simple and facile methods to fabricate ZnO nanomaterials with low cost and energy consumption. This review focuses on recent developments in the use of ZnO ETM for PSCs. The fabrication methods of ZnO materials are briefly introduced. The influence of different ZnO ETMs on performance of PSCs is then reviewed. The limitations of ZnO ETM-based PSCs and some solutions to these challenges are also discussed. The review provides a systematic and comprehensive understanding of the influence of different ZnO ETMs on PSCs performance and potentially motivates further development of PSCs by extending the knowledge of ZnO-based PSCs to TiO -based PSCs.

show abstract

Section: Pscs With Zno Nanorods Etmsmentioning

confidence: 63%

Perovskite Solar Cells with ZnO Electron‐Transporting Materials

et al. 2017

View full text Add to dashboard Cite

show abstract

“…This points to GBs either efficiently mediating nonradiative recombination or that charge carriers are simply deflected, which has been previously proposed. [ 5,44 ] As the focused excitation remains, we observe similar spatial redistribution of PL to what occurs in the single crystal (see Video S3 in the Supporting Information), establishing the light‐induced ionic defect migration. As the excitation is switched back to defocused mode (PL 1 ), we can confirm that PL remains significantly reduced exclusively for the grain that is excited (Figure 3c).…”

Section: Resultsmentioning

confidence: 99%

The Role of Grain Boundaries on Ionic Defect Migration in Metal Halide Perovskites

Phung

Al‐Ashouri

Meloni

et al. 2020

Advanced Energy Materials

145

129

View full text Add to dashboard Cite

Halide perovskites are emerging as revolutionary materials for optoelectronics. Their ionic nature and the presence of mobile ionic defects within the crystal structure have a dramatic influence on the operation of thin‐film devices such as solar cells, light‐emitting diodes, and transistors. Thin films are often polycrystalline and it is still under debate how grain boundaries affect the migration of ions and corresponding ionic defects. Laser excitation during photoluminescence (PL) microscopy experiments leads to formation and subsequent migration of ionic defects, which affects the dynamics of charge carrier recombination. From the microscopic observation of lateral PL distribution, the change in the distribution of ionic defects over time can be inferred. Resolving the PL dynamics in time and space of single crystals and thin films with different grain sizes thus, provides crucial information about the influence of grain boundaries on the ionic defect movement. In conjunction with experimental observations, atomistic simulations show that defects are trapped at the grain boundaries, thus inhibiting their diffusion. Hence, with this study, a comprehensive picture highlighting a fundamental property of the material is provided while also setting a theoretical framework in which the interaction between grain boundaries and ionic defect migration can be understood.

show abstract

“…Interestingly, when the DS additive was used under the same conditions, the J sc , V oc , and FF increase to 22.48 mA cm −2 , 1.103 V, and 0.742, respectively, yielding a PCE as high as 18.40%, the highest reported so far for F‐PSCs. The significantly larger J sc and FF are attributed to good crystallinity and large grain size, resulting in effective charge transport and less carrier recombination at grain boundaries . We fabricated MAPbI 3 –DS solar cells on both flexible and rigid substrates using identical condition, including the spin‐coating procedure, annealing temperature and time, etc.…”

Section: The Key J–v Parameters Of the F‐pscsmentioning

confidence: 99%

Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy

et al. 2018

View full text Add to dashboard Cite

Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F-PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F-PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F-PSCs. Meanwhile, the environmental stability of the F-PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F-PSCs for practical applications.

show abstract

Do grain boundaries dominate non-radiative recombination in CH₃NH₃PbI₃perovskite thin films?

Cited by 168 publications

References 33 publications

Perovskite Solar Cells with ZnO Electron‐Transporting Materials

Perovskite Solar Cells with ZnO Electron‐Transporting Materials

The Role of Grain Boundaries on Ionic Defect Migration in Metal Halide Perovskites

Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy

Contact Info

Product

Resources

About