Photoprotection in metal halide perovskites by ionic defect formation

Phung, Nga; Mattoni, Alessandro; Smith, Joel A.; Skroblin, Dieter; Köbler, Hans; Choubrac, Léo; Breternitz, Joachim; Li, Jinzhao; Unold, Thomas; Schorr, Susan; Gollwitzer, Christian; Scheblykin, Ivan G.; Unger, Eva; Saliba, Michael; Meloni, Simone; Abate, Antonio; Merdasa, Aboma

doi:10.1016/j.joule.2022.06.029

Cited by 25 publications

(23 citation statements)

References 72 publications

(95 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that defects and vacancies could accelerate the decomposition of CQDs, as well as lattice distortion. [ 23 ] Figure 1f displays the crystal structure schematic of CQDs with KTFA. Firstly, K + could passivate the defects of CQDs and reduce the nonradiative recombination losses.…”

Section: Resultsmentioning

confidence: 99%

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors

Sun

Zhao

et al. 2023

Advanced Optical Materials

View full text Add to dashboard Cite

communities, enabling flexible, highdetectivity and stable PDs possible. [3] Perovskite quantum dots (QDs) not only retain the attractive properties of perovskite bulk materials, but also exhibit enormous light absorption, owing to their nano-size effect and surpassed Shockley-Queisser (SQ) efficiency. [4] Therefore, they have become a research hotspot in the field of photodetection. [5] However, perovskite QDs are prone to generate defects on account of the low formation energy of defects. [6] These defects are considered to have negative effects on the stability and dark current of PDs. [7] In addition, it is noteworthy that the energy level mismatch between perovskite and the charge transport layer (HTL) would lead to undesirable recombination and make it difficult to achieve stable and high-detectivity PDs. [8] There are many methods used to improve the detectivity and stability of PDs. The photostability of CsPbBr 3 QD S PDs has been improved by constructing an interface layer. [9] But the photoresponse performance of PDs is enormously impacted. Ligand exchange and additive assisted strategy have been employed to improve the detectivity of CsPbBr 3 and CsPbI 3 QD S PDs, [10] but promoting sensitivity and stability of PDs at the same time remains a challenge. Moreover, CsPbBr 3 has been demonstrated to have excellent stability even without any encapsulation. [11] But the absorption of visible light is significantly limited because of the large band gap of 2.3 eV. [12] Although CsPbI 3 with a narrow band gap of 1.73 eV delivers a large photoresponse, its low tolerance factor results in poor structural stability at room temperature. [13] In comparison, CsPbBr 2 I has an appropriate band gap of 2.05 eV and possesses enhanced stability by increasing the contents of bromide ions, [14] which seems to be a good choice for balancing stability and light absorption range. [15] In this study, CsPbBr 2 I QD S (CQDs) with enhanced light absorption capacity and lattice stability are developed by the surface modulation via potassium trifluoroacetate (KTFA). Due to the formation of Pb-O bonds, defects and vacancies in CQDs are effectively passivated, inhibiting the nonradiative recombination of photogenerated charges. In addition, the improvement of work function and valence band alleviates the energy level mismatch of PDs, thus enhancing the hole transmission ability. More importantly, the overall performance of assembled PDs High-detectivity and stable photodetectors (PDs) have been intensively concerned in the field of wireless optical communication, among which perovskite material has become a prospective candidate owing to its outstanding photoelectric properties. However, the defects and mismatched energy levels of perovskite material can significantly reduce the detectivity and stability of PDs. Herein, the CsPbBr 2 I quantum dots (CQDs) with the surface modulation via potassium trifluoroacetate (KTFA) are utilized to deserve high-detectivity and stable PDs. The surface modulation for CQDs not only passivates defec...

show abstract

Section: Resultsmentioning

confidence: 99%

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors

Sun

Zhao

et al. 2023

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…They also provided a route to increase the photo‐stability of the absorber layer by carefully tuning octahedral tilt of the structure. Another research group, N. Phung et al., [127] discovered a self‐regulating photo‐protection mechanism in perovskite thin film by showing resistance towards degradation and they also claimed that the formation of defects due to exposure in light is beneficiary for photo‐stability.…”

Section: Impact Of Intrinsic Factors On Stabilitymentioning

confidence: 99%

Understanding the Degradation Factors, Mechanism and Initiatives for Highly Efficient Perovskite Solar Cells

et al. 2023

View full text Add to dashboard Cite

Perovskite solar cells (PSCs) are intriguing and viable challengers among all solar photovoltaic (PV) technologies worldwide due to their high conversion efficiency and simple manufacturing procedure. PSCs are currently thought to be very promising for the future generation of PV technology, which can make it easier to solving the rising energy demand. However, commercial mass production of PSCs is still far away due to their stability, and eco-friendly material issues. Extrinsic degradation is one of the vital issues for PSCs and various approaches are proposed and developed by researchers towards improve the quality and the stability of perovskite and other active materials for a PSC with longer lifetime. In this article, we conduct a systematic study to identify the major intrinsic and extrinsic degradation factors, and the degradation mechanism of PSCs. We investigate the potential approaches related to improving the stability and performance of the PSCs including encapsulation, interfacial layer engineering, additive engineering, ion engineering, and fabrication techniques. We also briefly point out the recent promising approaches to improve stability and power conversion efficiency (PCE) under various harsh conditions. This review will provide a better insight into the present scenario of the PSC as well.

show abstract

“…We note that the transience and short timescale of this remixing distinguishes it from the light-induced defect formation that has been reported to promote protection from material degradation in metal halide perovskites over longer timescales. [65,96]…”

Section: Light-induced Remixingmentioning

confidence: 99%

Temperature‐Dependent Reversal of Phase Segregation in Mixed‐Halide Perovskites

et al. 2023

View full text Add to dashboard Cite

Understanding the mechanism of light‐induced halide segregation in mixed‐halide perovskites is essential for their application in multijunction solar cells. Here, photoluminescence spectroscopy is used to uncover how both increases in temperature and light intensity can counteract the halide segregation process. It is observed that, with increasing temperature, halide segregation in CH3NH3Pb(Br0.4I0.6)3 first accelerates toward ≈290 K, before slowing down again toward higher temperatures. Such reversal is attributed to the trade‐off between the temperature activation of segregation, for example through enhanced ionic migration, and its inhibition by entropic factors. High light intensities meanwhile can also reverse halide segregation; however, this is found to be only a transient process that abates on the time scale of minutes. Overall, these observations pave the way for a more complete model of halide segregation and aid the development of highly efficient and stable perovskite multijunction and concentrator photovoltaics.

show abstract

Photoprotection in metal halide perovskites by ionic defect formation

Cited by 25 publications

References 72 publications

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors

Understanding the Degradation Factors, Mechanism and Initiatives for Highly Efficient Perovskite Solar Cells

Temperature‐Dependent Reversal of Phase Segregation in Mixed‐Halide Perovskites

Contact Info

Product

Resources

About

Photoprotection in metal halide perovskites by ionic defect formation

Cited by 25 publications

References 72 publications

Defect Passivation and Energy Level Modulation of CsPbBr2I QDs for High‐Detectivity and Stable Photodetectors

Defect Passivation and Energy Level Modulation of CsPbBr2I QDs for High‐Detectivity and Stable Photodetectors

Understanding the Degradation Factors, Mechanism and Initiatives for Highly Efficient Perovskite Solar Cells

Temperature‐Dependent Reversal of Phase Segregation in Mixed‐Halide Perovskites

Contact Info

Product

Resources

About

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors

Defect Passivation and Energy Level Modulation of CsPbBr₂I QDs for High‐Detectivity and Stable Photodetectors