Slow Diffusion and Long Lifetime in Metal Halide Perovskites for Photovoltaics

Bercegol, Adrien; Ramos, F. Javier; Rebai, Amelle; Guillemot, Thomas; Ory, Daniel S.; Rousset, Jean; Lombez, Laurent

doi:10.1021/acs.jpcc.8b08252

Cited by 26 publications

(41 citation statements)

References 72 publications

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“…Regarding bulk perovskite, estimated external radiative recombination coefficient values were close to previously reported ones, indicating the negligible impact of deep defects on charge carrier transport 45 – 47 . However, the shallow trap concentration valuates around 10 16 cm −3 , which is remarkably higher than the one measured for a half-cell ( N T = 4.2 × 10 14 cm −3 on FTO/bl-TiO 2 /mp-TiO 2 /perovskite) with the same chemical composition for the absorber 48 . This might be a consequence of the deposition of the Spiro-OMeTAD/ITO structure upon the perovskite.…”

Section: Resultsmentioning

confidence: 53%

Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon

Ramos¹,

Jutteau²,

Posada³

et al. 2018

Sci Rep

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In this work, the fabrication of MoOx-free semitransparent perovskite solar cells (PSC) with Power Conversion Efficiencies (PCE) up to 15.7% is reported. Firstly, opaque PSCs up to 19.7% were fabricated. Then, the rear metal contact was replaced by a highly transparent and conductive indium tin oxide (ITO) film, directly sputtered onto the hole selective layer, without any protective layer between Spiro-OMeTAD and rear ITO. To the best of our knowledge, this corresponds to the most efficient buffer layer-free semitransparent PSC ever reported. Using time-resolved photoluminescence (TRPL) technique on both sides of the semitransparent PSC, Spiro-OMeTAD/perovskite and perovskite/TiO2 interfaces were compared, confirming the great quality of Spiro-OMeTAD/perovskite interface, even after damage-less ITO sputtering, where degradation phenomena result less important than for perovskite/TiO2 one. Finally, a 4-terminal tandem was built combining semitransparent PSC with a commercially-available Aluminium Back Surface Field (Al-BSF) silicon wafer. That silicon wafer presents PCE = 19.52% (18.53% after being reduced to cell size), and 5.75% once filtered, to generate an overall 4 T tandem efficiency of 21.18% in combination with our champion large semitransparent PSC of 15.43%. It means an absolute increase of 1.66% over the original silicon wafer efficiency and a 2.65% over the cut Si cell.

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Section: Resultsmentioning

confidence: 53%

Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon

Ramos¹,

Jutteau²,

Posada³

et al. 2018

Sci Rep

Self Cite

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“…Future studies should also focus on isolating the diffusion properties of electrons from those of holes [6] . To do so, one could exploit the local depletion of electrons (holes) induced by a selective extraction layer in order to measure the diffusion of holes (electrons).…”

Section: Studying Carrier Photophysics In Operating Devicesmentioning

confidence: 99%

Imaging Carrier Transport Properties in Halide Perovskites using Time‐Resolved Optical Microscopy

Delport

Macpherson

Stranks

2020

Advanced Energy Materials

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Halide perovskites have remarkable properties for relatively crudely processed semiconductors, including large optical absorption coefficients and long charge carrier lifetimes. Thanks to such properties, these materials are now competing with established technologies for use in cost-effective and efficient light harvesting and light emitting devices. Nevertheless, our fundamental understanding of the behaviour of charge carriers in these materialsparticularly on the nano-to micro-scalehas on the whole lagged behind the empirical device performances. Such understanding is essential to control charge carriers, exploit new device structures, and push devices to their performance limits. Among other tools, optical microscopy and spectroscopic techniques have revealed rich information about charge carrier recombination and transport on important length scales. In this Progress Report, we detail the contribution of time-resolved optical microscopy techniques to our collective understanding of the photophysics of these materials. We discuss ongoing technical developments in the field that are overcoming traditional experimental limitations in order to visualise transport properties over multiple time and length scales. Finally, we propose strategies to combine optical microscopy with complementary techniques in order to obtain a holistic picture of local carrier photophysics in state-of-the-art perovskite devices.2 Over the last decade, there has been a dramatic rise in the efficiencies of light harvesting [1,2] , and light emitting [3,4] devices based on halide perovskite materials, with performances already rivalling existing commercial technologies. Perovskites are high-quality semiconductors with remarkable optoelectronic properties including an apparent defect tolerance [5] , long chargecarrier lifetimes [6] , long charge-carrier diffusion lengths [7,8] and sharp absorption edges [9] . However, they also exhibit complex heterogeneous morphological, chemical, structural and photo-physical properties across multiple length scales [10] arising from combinations of their hybrid organic-inorganic nature [11,12] , mixed chemical compositions [13] and their polycrystalline structure [14] , presenting challenges for rigorous charaterisation. A broad range of experimental techniques [10] has been employed to provide insight into their structural, chemical, morphological and macroscopic device operation properties, including electrical devices, diffraction, and electron microscopy characterization approaches, but these tools fall short in elucidating critical processes impacting device operation, namely the dynamics of photoexcited species and the transport of energy on all length scales. Optical spectroscopy techniques [15][16][17][18][19] directly probe the photophysics of materials and devices (see Figure 1a and b) making them powerful tools to establish and contextualise important properties such as absorption and photoluminescence [15] (PL) spectra [20,21] , exciton binding energies [22] , PL or device quantum efficien...

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“…[10,34,35,36] A wide amount of literature has been reported relating different methods through which to include water directly during the perovskite crystallization. However, it should be remarked that the highest PCEs are always obtained under completely dry environmental conditions, needing encapsulation techniques as an ally factor to enhance the long-term stability under real operation conditions.…”

Section: Effect Of H 2 O Into the Precursor Solutionmentioning

confidence: 99%

“…However, it should be remarked that the highest PCEs are always obtained under completely dry environmental conditions, needing encapsulation techniques as an ally factor to enhance the long-term stability under real operation conditions. [10,34,35,36] A wide amount of literature has been reported relating different methods through which to include water directly during the perovskite crystallization. [37] In 2015, Conings et.…”

Section: Effect Of H 2 O Into the Precursor Solutionmentioning

confidence: 99%

Crystalline Clear or Not: Beneficial and Harmful Effects of Water in Perovskite Solar Cells

2019

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Clarification of how water affects the photovoltaic performance of perovskite solar cells is one of the major challenges to successfully develop a large-scale low-cost fabrication process. Many authors have reported beneficial effects of moisture during the fabrication of perovskite solar cells (PSCs), such as enhanced crystallinity, photoluminescence and photovoltage. However, the highest power conversion efficiency reported until this date was obtained under completely dry atmosphere conditions, avoiding the presence of water during perovskite formulation and preserving the damage caused by moisture exposure with encapsulation techniques. This apparent contradiction makes patent the necessity of an extensive clarification to establish the conditions in which water represents a beneficial or harmful factor in the development of high efficiency and stable perovskite devices. In this review, we summarized the effects of water, both as an additive into the perovskite formulation as an additive and as moisture exposure during fabrication. We discuss in depth the structural and chemical effects, analysing also the photovoltaic consequences during operation conditions. As a final input, we remark a useful method to perform high efficiency PSCs under different lab ambient conditions and highlight the latest advances in hydrophobic devices and encapsulation techniques.

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Slow Diffusion and Long Lifetime in Metal Halide Perovskites for Photovoltaics

Cited by 26 publications

References 72 publications

Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon

Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon

Imaging Carrier Transport Properties in Halide Perovskites using Time‐Resolved Optical Microscopy

Crystalline Clear or Not: Beneficial and Harmful Effects of Water in Perovskite Solar Cells

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