Ultralow Absorption Coefficient and Temperature Dependence of Radiative Recombination of CH3NH3PbI3 Perovskite from Photoluminescence

Barugkin, Chog; Cong, Jinjin; Rahman, Saifur; Nguyen, Hieu T.; Macdonald, Daniel; White, Thomas P.; Catchpole, Kylie

doi:10.1021/acs.jpclett.5b00044

Cited by 78 publications

(73 citation statements)

References 31 publications

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“…The short-wavelength region (<730 nm) is identical among the locations. [29] On the other hand, the PL-based A curve reduces to a few orders of magnitude below 1%. Now, we demonstrate the described method to extract spatially and spectrally-resolved absorptivity A of a working PSC.…”

Section: Results and Analysismentioning

confidence: 99%

Spatially and Spectrally Resolved Absorptivity: New Approach for Degradation Studies in Perovskite and Perovskite/Silicon Tandem Solar Cells

Nguyen

Gerritsen

Mahmud

et al. 2019

Advanced Energy Materials

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a low-cost, industry-scalable photovoltaic (PV) technology. Single-junction PSCs have reached a light-to-electricity conversion efficiency of 25.2%. [1] Concurrently, perovskite/silicon tandem structures are attracting significant attention from the PV community as one of the most promising pathways to overcome the fundamental limit of single-junction solar cells. Monolithic perovskite/silicon tandem cells have achieved a record efficiency of 28% which is higher than that of crystalline silicon (c-Si) solar cells. [1] However, a major challenge for PSCs is their sensitivity to the surrounding environment and operating conditions. Light, oxygen, temperature, humidity, electric field, and more can all induce degradation in PSCs. [2][3][4][5][6] Therefore, an insightful understanding of the degradation mechanisms of PSCs is critical for the development of stable perovskite and perovskite/silicon tandem solar cells.The most direct way to observe degradation is to monitor finished solar cell performance through standard PV parameters including external/internal quantum yields, short circuit currents, open circuit voltages, fill factors, and efficiencies. [7][8][9][10] However, these are global parameters and thus cannot give information about how different degradation mechanisms evolve across the solar cells. Also, this approach requires a complete cell structure. Another common approach is to monitor photoluminescence (PL) or electroluminescence (EL) intensities of the devices via both mapping and imaging tools. [11][12][13][14][15] This approach yields spatial information and does not require a complete device (in case of PL measurements). However, luminescence intensity can be confounded by several competing mechanisms. Under excitation, there are two phenomena simultaneously happening and affecting the luminescence intensityion migration and light-induced trap deactivation. [16][17][18][19] The response rate to each phenomenon varies depending on initial qualities of the samples and also during the degradation process. [16][17][18][19] These two phenomena often obscure the detected luminescence signal during the intended degradation tests, Instability in perovskite solar cells is the main challenge for the commercialization of this solar technology. Here, a contactless, nondestructive approach is reported to study degradation across perovskite and perovskite/silicon tandem solar cells. The technique employs spectrally and spatially resolved absorptivity at sub-bandgap wavelengths of perovskite materials, extracted from their luminescence spectra. Parasitic absorption in other layers, carrier diffusion, and photon smearing phenomena are all demonstrated to have negligible effects on the extracted absorptivity. The absorptivity is demonstrated to reflect real degradation in the perovskite film and is much more robust and sensitive than its luminescence spectral peak position, representing its optical bandgap, and intensity. The technique is applied to study various common factors which induce and accelerate degradat...

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Section: Results and Analysismentioning

confidence: 99%

Spatially and Spectrally Resolved Absorptivity: New Approach for Degradation Studies in Perovskite and Perovskite/Silicon Tandem Solar Cells

Nguyen

Gerritsen

Mahmud

et al. 2019

Advanced Energy Materials

Self Cite

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“…For example, they have been successfully utilized in efficient thin film photovoltaic cells , lasers , light emitting devices , memristors and photodetectors . More recently, knowledge of the underlying fundamental phenomena that explain their behaviour has also advanced. OHPs can be processed via low temperature vacuum or solution deposition methods; have tailorable optical properties (gap and optical constants); exhibit high electron and hole mobilities relative to other disordered semiconductors; possess long diffusion lengths and carrier lifetimes; have low exciton binding energies at room temperature; and low free carrier bimolecular recombination .…”

Section: Introductionmentioning

confidence: 99%

Near infrared photodetectors based on sub‐gap absorption in organohalide perovskite single crystals

Lin

Armin

Burn

et al. 2016

Laser & Photonics Reviews

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Organohalide perovskite optoelectronics based upon large (mm‐sized) single crystals present exciting opportunities for new device platforms and fundamental studies. Herein, we report CH3NH3PbBr3 and CH3NH3PbI3 single crystals prepared via an inverse temperature crystallization method with strong near infrared photoresponses significantly below the optical gap. Light intensity dependent photocurrent measurements reveal the photoresponse is not a two‐photon phenomenon, but rather is derived from a linear mechanism. The effect (including responsivity and speed) is enhanced in a photoresistor architecture, indicating that the photoresponse is due to absorption into surface trap states in the crystal. Without any optimisation, respectable NIR responsivities at room temperature of ∼10‐2 A W−1 at a low 1V bias operating voltage are achieved. These results again demonstrate the remarkable potential of organohalide perovskites as light sensing materials, and the possibilities for engineering a new class of single crystal‐based optoelectronics.

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“…19 Few fully ab initio formulations of radiative recombination have been reported. 20 Calculations using the van Roosbroeck-Shockley relation with experimental 21 and theoretical 22 absorption coefficients have been published. We directly calculate the recombination rate without model parameters, adapting the standard theory of dielectric response to non-equilibrium carrier populations.…”

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confidence: 99%

Research Update: Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells

et al. 2016

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The hybrid perovskite CH 3 NH 3 PbI 3 (MAPI) exhibits long minority-carrier lifetimes and diffusion lengths. We show that slow recombination originates from a spin-split indirect-gap. Large internal electric fields act on spin-orbit-coupled band extrema, shifting band-edges to inequivalent wavevectors, making the fundamental gap indirect. From a description of photoluminescence within the quasiparticle self-consistent GW approximation for MAPI, CdTe and GaAs, we predict carrier lifetime as a function of light intensity and temperature. At operating conditions we find radiative recombination in MAPI is reduced by a factor of more than 350 compared to direct gap behavior. The indirect gap is retained with dynamic disorder.

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Ultralow Absorption Coefficient and Temperature Dependence of Radiative Recombination of CH₃NH₃PbI₃ Perovskite from Photoluminescence

Cited by 78 publications

References 31 publications

Spatially and Spectrally Resolved Absorptivity: New Approach for Degradation Studies in Perovskite and Perovskite/Silicon Tandem Solar Cells

Spatially and Spectrally Resolved Absorptivity: New Approach for Degradation Studies in Perovskite and Perovskite/Silicon Tandem Solar Cells

Near infrared photodetectors based on sub‐gap absorption in organohalide perovskite single crystals

Research Update: Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells

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