µ‐Graphene Crosslinked CsPbI<sub>3</sub> Quantum Dots for High Efficiency Solar Cells with Much Improved Stability

Wang, Qian; Jin, Zhiwen; Chen, Da; Bai, Dongliang; Bian, Hui; Sun, Jie; Zhu, Ge; Wang, Gang; Liu, Shengzhong

doi:10.1002/aenm.201800007

Cited by 206 publications

(195 citation statements)

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“…[39][40][41][42][43][44][45] The change from bulk to nanoscale endows materials new advantages in engineering discrete energy levels, solution processing, and composition management. Quite recently, all-inorganic perovskite nanocrystals or QDs with CsPbX 3 stoichiometry quickly emerged and attracted wide attention in optoelectronic devices due to their flexible composition adjustment, size tunability, high tolerance to defects, and greatly improved phase stability.…”

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confidence: 99%

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ling

Zhou

Yuan

et al. 2019

Advanced Energy Materials

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During the past decade, inorganic CQDs, namely the lead chalcogenides (e.g., PbS), have attracted tremendous attention in solution-processed solar cells. Due to the great efforts on CQDs synthesis modification, [7][8][9] surface passivation, [10][11][12] and device fabrication optimization, [13][14][15][16] PbS QD solar cells continue to progress at an extraordinary rate, improving overall efficiencies by ≈1% per year and currently have a certified power conversion efficiency (PCE) exceeding 12%. [17] Meanwhile, the past decade has witnessed unprecedented success of organicinorganic hybrid perovskites in PV applications, with the reported PCE of perovskite solar cells exceeding 23%. [18][19][20][21][22][23][24][25][26][27][28] However, the challenging stability issues of these hybrid perovskites further motivate the research of all-inorganic perovskites (CsPbX 3 , X = Cl − , Br − , I − or mixed halides) without any volatile organic components. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications. However, the nonphotoactive orthorhombic phase (E g = 2.82 eV) is more thermodynamically preferred at low temperature. [29] Therefore, the perovskite phase of CsPbI 3 usually requires complex annealing processes at high temperature to achieve satisfactory film quality. As mentioned above, QD technology offers colloidal synthesis of conventional bulk materials, which Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI 3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs 2 CO 3 ), and cesium nitrate (CsNO 3 )) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI 3 perovskite surface but also improve electron coupling between CsPbI 3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI 3 QD solar cells. In addition, the Cs-salt-treated CsPbI 3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties. Perovskite Quantum DotsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Solution-processed colloidal quantum dots (CQDs) are promising candidates for the next generation photovoltaics (PVs) due to the excellent tuna...

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mentioning

confidence: 99%

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ling

Zhou

Yuan

et al. 2019

Advanced Energy Materials

269

282

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“…[44] 2D structure mixing into the 3D films as quasi-2D perovskite or as component has been recognized as a possible route to obtain both the stability and high PCE for PSCs. [47] Recently, Ma and co-workers pointed that Yb doping can reduce the number of defects and trap states, and obtained high PCE of 14.1%. [45] And most recently, Grätzel and coworkers also updated the PCE of 3D/2D organic-inorganic hybrid PSCs over 22% with water-and heat-resistant operationally stable.…”

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confidence: 99%

Ruddlesden–Popper 2D Component to Stabilize γ‐CsPbI₃ Perovskite Phase for Stable and Efficient Photovoltaics

Wang

Zhou

et al. 2019

Advanced Energy Materials

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The highest certified power conversion efficiency (PCE) of black phase based CsPbI3 perovskite solar cells has exceeded 18%, and become a hotspot in recent progress. However, the black phase of CsPbI3 rapidly transforms to yellow phase in ambient conditions due to its thermodynamic instability. Here, a Ruddlesden–Popper 2D structure is introduced into γ‐CsPbI3 film to stabilize the black phase via reducing dimensionality. It is found that a judicious amount of phenylethylammonium iodide can adjust the dimensionality of γ‐CsPbI3 film from 2D to quasi‐2D and 3D phase. Comprehensive consideration to obtain both the stability and high PCE, quasi‐2D (n = 40) γ‐CsPbI3 delivers a reproducible PCE of 13.65% with negligible hysteresis. By utilizing femtosecond transient absorption and time‐resolved PL decay, similar carrier kinetics in n = 40 and ∞ samples are observed, meaning an efficient charge extraction. More importantly, when the device is placed at 80 °C in N2 condition or in air with RH of 25–30%, its PCE keeps ≈88% and ≈89% of its initial PCE after 12 days, respectively. Such results are better than the 3D one (≈69% and ≈16%, respectively).

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“…In der Regel wird daher ein "Solvens-Engineering" durchgeführt. [85,86] Diese Methode bietet einen neuen Wegf ürd ie einstufige,g roßflächige Herstellung von CsPbX 3 -Zellen. [83] Meng et al berichteten über eine Methode zur Verbesserung der Qualitätv on CsPb(I x Br 1Àx ) 3 -Schichten durch zweistufige Multi-Spin-Beschichtung.D urch Zugabe von DMSO zur CsBr/Methanol-Vorstufe erhielten sie kompakte und Pinhole-freie Perowskit-Filme.S ie fanden, dass die Einführung von DMSO die Lçslichkeit von CsBr verbessern kann, was zusätzlich die Morphologien, optischen Eigenschaften und die photovoltaische Leistung der CsPb-(I x Br 1À x) 3 -Schichten beeinflusste.…”

Section: Reine Lçsungsverfahrenunclassified

“…[85] [108] Die gleiche Arbeitgruppe untersuchte in einer weiteren Studie den Mechanismus dieser Ligandenaustauschverfahren( Abbildung 5d,e) durch Hydrolyse von MeOAc zu AcH, das das langkettige Oleat ersetzt, sowie die kontrollierte Substitution der Oleylammoniumkationen durch kleinere FA-Kationen. [86] wurde PTAA (Polytriarylamin) verwendet. [86] wurde PTAA (Polytriarylamin) verwendet.…”

Section: Angewandte Chemieunclassified

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Anorganische CsPbX₃‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

et al. 2019

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+ + ]D ie Autoren haben zu gleichen Teilen zu dieser Arbeit beigetragen. Die Identifikationsnummern (ORCID) der Autoren sind unter https://doi.org/10.1002/ange.201901081 zu finden.Perowskite auf Halogenidbasis haben sicha ufgrund ihrer hervorragenden optoelektronischen Eigenschaften zu einem der wichtigsten Themen in der Photovoltaik-Forschung entwickelt. Insbesondere wurden bei organisch-anorganischen Perowskit-Solarzellen (PSCs) rasche Fortschritte beim Wirkungsgrad (PCE, power conversion efficiency) erreicht, mit einem derzeitigen Rekordwert von 23.7 %PCE. Die an sichinstabile Beschaffenheit dieser Materialien, insbesondere gegenüber Feuchtigkeit und Wärme,stellt jedoch ein Problem bezüglichihrer Langzeitstabilitätd ar.Der Ersatz der fragilen organischen Gruppe durch robustere anorganische Cs + -Kationen ergibt Caesiumbleihalogenide CsPbX 3 (X = Halogenid), die thermischv iel stabiler und meist auchs tabiler gegen andere Faktoren sind. Seit dem ersten Bericht im Jahr 2015 ist der PCE von CsPbX 3 -basierten PSCs von 2.9 %bis auf heute 17.1 %m it deutlichv erbesserter Stabilitätg estiegen. In diesem Aufsatz sollen die bisherigen Ergebnisse auf dem Gebiet zusammenfasst und Lçsungen fürE ntwicklungsengpässe vorgeschlagen werden.

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µ‐Graphene Crosslinked CsPbI₃ Quantum Dots for High Efficiency Solar Cells with Much Improved Stability

Cited by 206 publications

References 63 publications

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ruddlesden–Popper 2D Component to Stabilize γ‐CsPbI₃ Perovskite Phase for Stable and Efficient Photovoltaics

Anorganische CsPbX₃‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

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µ‐Graphene Crosslinked CsPbI3 Quantum Dots for High Efficiency Solar Cells with Much Improved Stability

Cited by 206 publications

References 63 publications

14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ruddlesden–Popper 2D Component to Stabilize γ‐CsPbI3 Perovskite Phase for Stable and Efficient Photovoltaics

Anorganische CsPbX3‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

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µ‐Graphene Crosslinked CsPbI₃ Quantum Dots for High Efficiency Solar Cells with Much Improved Stability

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ruddlesden–Popper 2D Component to Stabilize γ‐CsPbI₃ Perovskite Phase for Stable and Efficient Photovoltaics

Anorganische CsPbX₃‐Perowskit‐Solarzellen: Fortschritte und Perspektiven