Time resolved luminescence spectroscopy of CsPbBr3 single crystal

Dendebera, M.; Chornodolskyy, Ya. M.; Gamernyk, R. V.; Antonyak, O. T.; Pashuk, I. P.; Myagkota, S. V.; Gnilitskyi, Iaroslav; Pankratov, V.; Vistovskyy, V.; Mykhaylyk, Vitaliy; Grinberg, M.; Voloshinovskii, А.

doi:10.1016/j.jlumin.2020.117346

Cited by 25 publications

(16 citation statements)

References 31 publications

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“…In halide perovskites, the role of excitons during emission is controversially discussed. Most likely, for a holistic understanding of the recombination behavior, free charge carrier as well as excitons have to be considered [45][46][47]. The energy of the absorption maximum is only 30 meV higher than the emission maximum.…”

Section: Resultsmentioning

confidence: 99%

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Sanders

Simkus

Riedel

et al. 2021

Journal of Materials Research

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CsPbBr3 represents a highly attractive material for perovskite light-emitting diodes (PeLEDs) in the green spectral range. However, the lack of deposition tools for reproducible and scalable growth of perovskite films is one of the major obstacles hindering PeLED commercialization. Here, we employ the highly scalable showerhead-assisted chemical vapor deposition (CVD) method to produce uniform pinhole-free CsPbBr3 films for PeLED application. The precursors CsBr and PbBr2 are evaporated under low vacuum in N2 carrier gas. By adjusting the PbBr2 sublimation temperature, process conditions for CsBr-rich, stoichiometric, and PbBr2-rich CsPbBr3 layer growth have been developed. A substrate temperature of 160 °C enables direct growth of these CsPbBr3 films on a polymeric hole transport layer (HTL), finally yielding PeLEDs with a maximum luminance of 125 cd/m2. Although the device efficiency still lags behind solution-processed counterparts, our approach presents the first demonstration of PeLEDs containing CsPbBr3 films processed in a perovskite showerhead-assisted CVD reactor. Graphic abstract

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Section: Resultsmentioning

confidence: 99%

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Sanders

Simkus

Riedel

et al. 2021

Journal of Materials Research

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“…Íà íîâèé ðiâåíü äîñëiäaeåííÿ íàíî÷àñòèíîê ïåðîâñüêiòiâ âèéøëè, îòðèìàâøè¨õ ó âèãëÿäi êîëî¨äíèõ ðîç÷èíiâ [7,8]. Çàñòîñóâàííÿ ìåòîäiâ ñïåêòðîñêîïi¨ç ÷àñîâèì ðîçäiëåííÿì [9,10], ìà-ãíiòîîïòè÷íèõ äîñëiäaeåíü [11], âèêîðèñòàííÿ ãiäðî-ñòàòè÷íèõ òèñêiâ [12,13] äàëî íèçêó ðåçóëüòàòiâ, ùî ïîðîäèëè ðiçíîìàíiòíi ìîäåëi ëþìiíåñöåíòíèõ ïðîöåñiâ ó íàíîêðèñòàëàõ. Äëÿ ïîÿñíåííÿ ïðèðîäè ñïîñòå-ðåaeóâàíî¨åêñèòîííî¨ëþìiíåñöåíöi¨âðàõîâàíî âïëèâ îáìiííî¨âçà¹ìîäi¨, ùî ñïðè÷èíèëî ïîÿâó ìîäåëi çi ñèí ëåòíèìè òà òðèïëåòíèìè åêñèòîíàìè.…”

Section: âñòóïunclassified

“…Äëÿ ïîÿñíåííÿ ïðèðîäè ñïîñòå-ðåaeóâàíî¨åêñèòîííî¨ëþìiíåñöåíöi¨âðàõîâàíî âïëèâ îáìiííî¨âçà¹ìîäi¨, ùî ñïðè÷èíèëî ïîÿâó ìîäåëi çi ñèí ëåòíèìè òà òðèïëåòíèìè åêñèòîíàìè. Îñîáëèâîñòi ñïiíîðáiòàëüíî¨âçà¹ìîäi¨ïðèâåëè äî âðàõóâàííÿ åôåêòó Ðàøáè, ùî ñóïðîâîäaeó¹òüñÿ âèíèêíåííÿì äîäàòêîâèõ âèïðîìiíþâàëüíèõ ñòàíiâ, ÿêi çóìîâëþþòü íåïðÿìó ëþìiíåñöåíöiþ åêñèòîíiâ [10,13,14]. Çà ïåâíèõ òåìïåðàòóð ïîíàä 70 K ó ìîíîêðèñòàòàëàõ CsPbBr 3 ïåðåâàãà íàäà¹òüñÿ ðåêîìáiíàöiéíîìó ìåõàíiçìó ëþìiíåñöåíöi¨íà âiäìiíó åêñèòîííîìó.…”

Section: âñòóïunclassified

“…Êîíñòàíòà çàãàñàííÿ ñèñòåìè øèðîêèõ ñìóã Ñ çà 550 íì çíà÷íî ïåðåâåðøó¹ ÷àñîâèé äiàïàçîí âèìiðþâàíü âèêîðèñòàíîãî ìåòîäó. Òîìó ÷àñîâà êîíñòàíòà äëÿ öi¹¨ñìóãè ìîaeå áóòè áëèçüêî ìiêðî-÷è íàâiòü ìiëiñåêóíä, ÿê öå ¹ â ìîíîêðèñòàëi [10]. Ïðèáëèçíi ðîçìiðè âêðàïëåíèõ ÷àñòèíîê, ïðèðîäó ñìóã¨õíüî¨ëþìiíåñöåíöi¨â ìàòðèöi KBr ìîaeíà îöiíèòè, ïîðiâíþþ÷è ïàðàìåòðè ëþìiíåñöåíöi¨KBr CsPbBr 3 ç òàêèìè ñàìèìè äëÿ ìîíî-òà íàíîêðèñòàëiâ CsPbBr 3 .…”

Section: âñòóïunclassified

“…1,ñ). Ïîìiae áàãàòüîõ ïiäõîäiâ äî iíòåðïðåòà-öi¨öèõ ñìóã ëþìiíåñöåíöi¨ìîíîêðèñòàëà CsPbBr 3 ¹ âèêîðèñòàííÿ åôåêòó Ðàøáè [10,13,14]. Ó ìåaeàõ öi-¹¨ìîäåëi ñìóãó 532 íì (20 Ê) ìîaeíà iíòåðïðåòóâàòè ÿê âèïðîìiíþâàííÿ, çóìîâëåíå ïðÿìèìè ïåðåõîäàìè â òî÷öi Ã çîíè Áðiëëþåíà äëÿ îðòîðîìái÷íî¨ôàçè [16 18], à ñìóãó 540 íì (20 Ê) ÿê íåïðÿìi ïåðåõîäè ç ðàøáiâñüêèõ äîëèí.…”

Section: âñòóïunclassified

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Luminescence of CsPbBr₃ microcrystals embedded in the KBr matrix

Dendebera¹,

Chornodolskyy²,

Antonyak³

et al. 2021

J. Phys. Stud.

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Understanding Thermal and A‐Thermal Trapping Processes in Lead Halide Perovskites Towards Effective Radiation Detection Schemes

Rodà

Fasoli

Zaffalon

et al. 2021

Adv Funct Materials

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Lead halide perovskites (LHP) are rapidly emerging as efficient, low-cost, solution-processable scintillators for radiation detection. Carrier trapping is arguably the most critical limitation to the scintillation performance. Nonetheless, no clear picture of the trapping and detrapping mechanisms to/ from shallow and deep trap states involved in the scintillation process has been reported to date, as well as on the role of the material dimensionality.Here, this issue is addressed by performing, for the first time, a comprehensive study using radioluminescence and photoluminescence measurements side-by-side to thermally-stimulated luminescence (TSL) and afterglow experiments on CsPbBr 3 with increasing dimensionality, namely nanocubes, nanowires, nanosheets, and bulk crystals. All systems are found to be affected by shallow defects resulting in delayed intragap emission following detrapping via a-thermal tunneling. TSL further reveals the existence of additional temperature-activated detrapping pathways from deeper trap states, whose effect grows with the material dimensionality, becoming the dominant process in bulk crystals. These results highlight that, compared to massive solids where the suppression of both deep and shallow defects is critical, low dimensional nanostructures are more promising active materials for LHP scintillators, provided that their integration in functional devices meets efficient surface engineering.

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Time resolved luminescence spectroscopy of CsPbBr3 single crystal

Cited by 25 publications

References 31 publications

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Luminescence of CsPbBr₃ microcrystals embedded in the KBr matrix

Understanding Thermal and A‐Thermal Trapping Processes in Lead Halide Perovskites Towards Effective Radiation Detection Schemes

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Time resolved luminescence spectroscopy of CsPbBr3 single crystal

Cited by 25 publications

References 31 publications

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

Luminescence of CsPbBr3 microcrystals embedded in the KBr matrix

Understanding Thermal and A‐Thermal Trapping Processes in Lead Halide Perovskites Towards Effective Radiation Detection Schemes

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Product

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Luminescence of CsPbBr₃ microcrystals embedded in the KBr matrix