Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector

S.D. Stranks, S.M. Wood, K. Wojciechowski, F. Deschler, M. Saliba, H. Khandelwal, J.B. Patel, S. Elston, L.M. Herz, M.B. Johnston, A.P.H.J. Schenning, M.G. Debije, M.K. Riede, S.M. Morris, H.J. Snaith

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Abstract

Organic–inorganic perovskites are highly promising solar cell materials with laboratory-based power conversion efficiencies already matching those of established thin film technologies. Their exceptional photovoltaic performance is in part attributed to the presence of efficient radiative recombination pathways, thereby opening up the possibility of efficient light-emitting devices. Here, we demonstrate optically pumped amplified spontaneous emission (ASE) at 780 nm from a 50 nm-thick film of CH3NH3PbI3 perovskite that is sandwiched within a cavity composed of a thin-film (~7 µm) cholesteric liquid crystal (CLC) reflector and a metal back-reflector. The threshold fluence for ASE in the perovskite film is reduced by at least two orders of magnitude in the presence of the CLC reflector, which results in a factor of two reduction in threshold fluence compared to previous reports. We consider this to be due to improved coupling of the oblique and out-of-plane modes that are reflected into the bulk in addition to any contributions from cavity modes. Furthermore, we also demonstrate enhanced ASE on flexible reflectors and discuss how improvements in the quality factor and reflectivity of the CLC layers could lead to single-mode lasing using CLC reflectors. Our work opens up the possibility of fabricating widely wavelength-tunable "mirror-less" single-mode lasers on flexible substrates, which could find use in applications such as flexible displays and friend or foe identification.
Original languageEnglish
Pages (from-to)4935-4941
Number of pages7
JournalNano Letters
Volume15
Issue number8
DOIs
Publication statusPublished - Aug 2015

Fingerprint

Cholesteric liquid crystals
Spontaneous emission
perovskites
spontaneous emission
reflectors
liquid crystals
Perovskite
Flexible displays
fluence
Thin films
Laser modes
Thick films
cavities
thresholds
Conversion efficiency
laser modes
radiative recombination
Solar cells
thin films
Mirrors

Keywords

  • Organic-inorganic perovskite
  • photoluminescence
  • lasing passivation
  • cholesteric liquid crystal
  • flexible
  • amplified spontaneous emission

Cite this

Stranks, S. D., Wood, S. M., Wojciechowski, K., Deschler, F., Saliba, M., Khandelwal, H., ... Snaith, H. J. (2015). Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector. Nano Letters, 15(8), 4935-4941. https://doi.org/10.1021/acs.nanolett.5b00678
Stranks, S.D. ; Wood, S.M. ; Wojciechowski, K. ; Deschler, F. ; Saliba, M. ; Khandelwal, H. ; Patel, J.B. ; Elston, S. ; Herz, L.M. ; Johnston, M.B. ; Schenning, A.P.H.J. ; Debije, M.G. ; Riede, M.K. ; Morris, S.M. ; Snaith, H.J. / Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector. In: Nano Letters. 2015 ; Vol. 15, No. 8. pp. 4935-4941.
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abstract = "Organic–inorganic perovskites are highly promising solar cell materials with laboratory-based power conversion efficiencies already matching those of established thin film technologies. Their exceptional photovoltaic performance is in part attributed to the presence of efficient radiative recombination pathways, thereby opening up the possibility of efficient light-emitting devices. Here, we demonstrate optically pumped amplified spontaneous emission (ASE) at 780 nm from a 50 nm-thick film of CH3NH3PbI3 perovskite that is sandwiched within a cavity composed of a thin-film (~7 µm) cholesteric liquid crystal (CLC) reflector and a metal back-reflector. The threshold fluence for ASE in the perovskite film is reduced by at least two orders of magnitude in the presence of the CLC reflector, which results in a factor of two reduction in threshold fluence compared to previous reports. We consider this to be due to improved coupling of the oblique and out-of-plane modes that are reflected into the bulk in addition to any contributions from cavity modes. Furthermore, we also demonstrate enhanced ASE on flexible reflectors and discuss how improvements in the quality factor and reflectivity of the CLC layers could lead to single-mode lasing using CLC reflectors. Our work opens up the possibility of fabricating widely wavelength-tunable {"}mirror-less{"} single-mode lasers on flexible substrates, which could find use in applications such as flexible displays and friend or foe identification.",
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author = "S.D. Stranks and S.M. Wood and K. Wojciechowski and F. Deschler and M. Saliba and H. Khandelwal and J.B. Patel and S. Elston and L.M. Herz and M.B. Johnston and A.P.H.J. Schenning and M.G. Debije and M.K. Riede and S.M. Morris and H.J. Snaith",
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Stranks, SD, Wood, SM, Wojciechowski, K, Deschler, F, Saliba, M, Khandelwal, H, Patel, JB, Elston, S, Herz, LM, Johnston, MB, Schenning, APHJ, Debije, MG, Riede, MK, Morris, SM & Snaith, HJ 2015, 'Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector', Nano Letters, vol. 15, no. 8, pp. 4935-4941. https://doi.org/10.1021/acs.nanolett.5b00678

Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector. / Stranks, S.D.; Wood, S.M.; Wojciechowski, K.; Deschler, F.; Saliba, M.; Khandelwal, H.; Patel, J.B.; Elston, S.; Herz, L.M.; Johnston, M.B.; Schenning, A.P.H.J.; Debije, M.G.; Riede, M.K.; Morris, S.M.; Snaith, H.J.

In: Nano Letters, Vol. 15, No. 8, 08.2015, p. 4935-4941.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector

AU - Stranks, S.D.

AU - Wood, S.M.

AU - Wojciechowski, K.

AU - Deschler, F.

AU - Saliba, M.

AU - Khandelwal, H.

AU - Patel, J.B.

AU - Elston, S.

AU - Herz, L.M.

AU - Johnston, M.B.

AU - Schenning, A.P.H.J.

AU - Debije, M.G.

AU - Riede, M.K.

AU - Morris, S.M.

AU - Snaith, H.J.

PY - 2015/8

Y1 - 2015/8

N2 - Organic–inorganic perovskites are highly promising solar cell materials with laboratory-based power conversion efficiencies already matching those of established thin film technologies. Their exceptional photovoltaic performance is in part attributed to the presence of efficient radiative recombination pathways, thereby opening up the possibility of efficient light-emitting devices. Here, we demonstrate optically pumped amplified spontaneous emission (ASE) at 780 nm from a 50 nm-thick film of CH3NH3PbI3 perovskite that is sandwiched within a cavity composed of a thin-film (~7 µm) cholesteric liquid crystal (CLC) reflector and a metal back-reflector. The threshold fluence for ASE in the perovskite film is reduced by at least two orders of magnitude in the presence of the CLC reflector, which results in a factor of two reduction in threshold fluence compared to previous reports. We consider this to be due to improved coupling of the oblique and out-of-plane modes that are reflected into the bulk in addition to any contributions from cavity modes. Furthermore, we also demonstrate enhanced ASE on flexible reflectors and discuss how improvements in the quality factor and reflectivity of the CLC layers could lead to single-mode lasing using CLC reflectors. Our work opens up the possibility of fabricating widely wavelength-tunable "mirror-less" single-mode lasers on flexible substrates, which could find use in applications such as flexible displays and friend or foe identification.

AB - Organic–inorganic perovskites are highly promising solar cell materials with laboratory-based power conversion efficiencies already matching those of established thin film technologies. Their exceptional photovoltaic performance is in part attributed to the presence of efficient radiative recombination pathways, thereby opening up the possibility of efficient light-emitting devices. Here, we demonstrate optically pumped amplified spontaneous emission (ASE) at 780 nm from a 50 nm-thick film of CH3NH3PbI3 perovskite that is sandwiched within a cavity composed of a thin-film (~7 µm) cholesteric liquid crystal (CLC) reflector and a metal back-reflector. The threshold fluence for ASE in the perovskite film is reduced by at least two orders of magnitude in the presence of the CLC reflector, which results in a factor of two reduction in threshold fluence compared to previous reports. We consider this to be due to improved coupling of the oblique and out-of-plane modes that are reflected into the bulk in addition to any contributions from cavity modes. Furthermore, we also demonstrate enhanced ASE on flexible reflectors and discuss how improvements in the quality factor and reflectivity of the CLC layers could lead to single-mode lasing using CLC reflectors. Our work opens up the possibility of fabricating widely wavelength-tunable "mirror-less" single-mode lasers on flexible substrates, which could find use in applications such as flexible displays and friend or foe identification.

KW - Organic-inorganic perovskite

KW - photoluminescence

KW - lasing passivation

KW - cholesteric liquid crystal

KW - flexible

KW - amplified spontaneous emission

U2 - 10.1021/acs.nanolett.5b00678

DO - 10.1021/acs.nanolett.5b00678

M3 - Article

C2 - 25989354

VL - 15

SP - 4935

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JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

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ER -

Stranks SD, Wood SM, Wojciechowski K, Deschler F, Saliba M, Khandelwal H et al. Enhanced Amplified Spontaneous Emission in Perovskites Using a Flexible Cholesteric Liquid Crystal Reflector. Nano Letters. 2015 Aug;15(8):4935-4941. https://doi.org/10.1021/acs.nanolett.5b00678