Reduced Carrier Recombination in PbS - CuInS2 Quantum Dot Solar Cells

Sun, Zhenhua; Sitbon, Gary; Pons, Thomas; Bakulin, Artem A.; Chen, Zhuoying

doi:10.1038/srep10626

Cited by 51 publications

(61 citation statements)

References 50 publications

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“…The power value α for both devices is 0.9, close to unity (first-order). This means that trap-assisted recombination is present in both solar cells and is the dominating loss mechanism 24, 25 . The light-intensity-dependent V OC can provide critical insights into the recombination mechanism in the solar cells 26 .…”

Section: Resultsmentioning

confidence: 99%

Vapor transport deposition of antimony selenide thin film solar cells with 7.6% efficiency

et al. 2018

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Antimony selenide is an emerging promising thin film photovoltaic material thanks to its binary composition, suitable bandgap, high absorption coefficient, inert grain boundaries and earth-abundant constituents. However, current devices produced from rapid thermal evaporation strategy suffer from low-quality film and unsatisfactory performance. Herein, we develop a vapor transport deposition technique to fabricate antimony selenide films, a technique that enables continuous and low-cost manufacturing of cadmium telluride solar cells. We improve the crystallinity of antimony selenide films and then successfully produce superstrate cadmium sulfide/antimony selenide solar cells with a certified power conversion efficiency of 7.6%, a net 2% improvement over previous 5.6% record of the same device configuration. We analyze the deep defects in antimony selenide solar cells, and find that the density of the dominant deep defects is reduced by one order of magnitude using vapor transport deposition process.

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Section: Resultsmentioning

confidence: 99%

Vapor transport deposition of antimony selenide thin film solar cells with 7.6% efficiency

et al. 2018

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“…This observation was consistent with the phenomenon observed in photovoltaic devices showing a higher V oc with ITIC. In TPC measurement (Figure f), the device with ITIC had a much shorter decay time constant of 3.2 µs compared to that of the reference device (6.4 µs), suggesting a faster carrier collection with ITIC . As shown in atomic force microscopy (AFM) images in Figure S10a,d in the Supporting Information, CQD films with ITIC had similar morphology with that of reference sample, indicating that the effect of morphology on device performance was negligible.…”

mentioning

confidence: 92%

“…In order to facilitate such charge separation process and thus reduce the charge recombination in conventional CQD solar cells, a lot of efforts have been developed, such as core–shell structural design, surface ligand modification, and device structure engineering . These available strategies employed in the traditional CQDs devices, however, are still not compatible with perovskite CQD system owing to their vulnerable structural stability as well as absence of well‐established synthetic routes .…”

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confidence: 99%

A Small‐Molecule “Charge Driver” enables Perovskite Quantum Dot Solar Cells with Efficiency Approaching 13%

et al. 2019

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also the multiple exciton generation phenomenon, specific to CQDs, opens an avenue to make full utilization of solar radiation. [5][6][7] Recently, halide perovskite CQDs have emerged as a new class of CQDs for photovoltaics, offering compelling combination of the advantages of traditional CQDs and exceptional properties of halide perovskite materials, such as the desirable bandgap, high absorption coefficient, and defect tolerance. [8][9][10] Furthermore, the perovskite CQDs, such as CsPbI 3 and formamidinium lead iodide (FAPbI 3 ), were reported to show superior phase stability over their bulk form owing to the size-induced lattice strain and enhanced contribution from the surface energy. [11,12] Accordingly, the CQD solar cells based on the perovskite material have demonstrated a great potential with a record power conversion efficiency (PCE) as high as 13% along with excellent operational stability. [12,13] Although perovskite materials display superior optoelectronic properties to the conventional semiconductors, the low charge carrier separation efficiency, which is one of the critical obstacles toward higher performance of traditional CQD devices, still remains in the perovskite CQD solar cells. [14] While exciton binding energies (E b ) of bulk perovskite materials were measured to be as low as few millielectronvolts, facilitating spontaneous generation of free carriers at room temperature, [15] the E b of the perovskite CQD was estimated to be significantly higher (up to ten times) than that of the bulk counterparts. [9,16] As a result, the photogenerated charge carriers in the CQD films are subjected to be lost through recombination before being extracted to selective contact layers. [17] Therefore, promoting effective charge separation to reduce recombination becomes a crucial factor for boosting the PCE of the perovskite CQD solar cells.In order to facilitate such charge separation process and thus reduce the charge recombination in conventional CQD solar cells, a lot of efforts have been developed, such as coreshell structural design, surface ligand modification, and device structure engineering. [18][19][20][21][22][23] These available strategies employed in the traditional CQDs devices, however, are still not compatible with perovskite CQD system owing to their vulnerable structural stability as well as absence of well-established Halide perovskite colloidal quantum dots (CQDs) have recently emerged as a promising candidate for CQD photovoltaics due to their superior optoelectronic properties to conventional chalcogenides CQDs. However, the low charge separation efficiency due to quantum confinement still remains a critical obstacle toward higher-performance perovskite CQD photovoltaics. Available strategies employed in the conventional CQD devices to enhance the carrier separation, such as the design of type-II core-shell structure and versatile surface modification to tune the electronic properties, are still not applicable to the perovskite CQD system owing to the difficulty in modulating surfac...

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“…As summarized in Table 1, maximum diffusion lengths of about 230 nm have been achieved in CQD films using RnH 2 -Cl or CdCl 2 passivation, leaving a discrepancy of a few hundred nanometers between the absorption and transport length scales. The maximum photocurrent possible for a material with a band gap of 1.3 eV is calculated to be 36 mA/cm 2 [148]; maximum photocurrents achieved in CQD SCs with band gaps near 1.3 eV today are approaching 30 mA/cm 2 [23,25,187,188]. Therefore, photocurrent enhancements on the order of at least 20% are needed to approach the theoretical limits.…”

Section: Depleted Heterojunction Cqd Photovoltaicsmentioning

confidence: 99%

Advancing colloidal quantum dot photovoltaic technology

et al. 2016

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Colloidal quantum dots (CQDs) are attractive materials for solar cells due to their low cost, ease of fabrication and spectral tunability. Progress in CQD photovoltaic technology over the past decade has resulted in power conversion efficiencies approaching 10%. In this review, we give an overview of this progress, and discuss limiting mechanisms and paths for future improvement in CQD solar cell technology. We briefly summarize nanoparticle synthesis and film processing methods and evaluate the optoelectronic properties of CQD films, including the crucial role that surface ligands play in materials performance. We give an overview of device architecture engineering in CQD solar cells. The compromise between carrier extraction and photon absorption in CQD photovoltaics is analyzed along with different strategies for overcoming this trade-off. We then focus on recent advances in absorption enhancement through innovative device design and the use of nanophotonics. Several light-trapping schemes, which have resulted in large increases in cell photocurrent, are described in detail. In particular, integrating plasmonic elements into CQD devices has emerged as a promising approach to enhance photon absorption through both near-field coupling and far-field scattering effects. We also discuss strategies for overcoming the single junction efficiency limits in CQD solar cells, including tandem architectures, multiple exciton generation and hybrid materials schemes. Finally, we offer a perspective on future directions for the field and the most promising paths for achieving higher device efficiencies.

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Reduced Carrier Recombination in PbS - CuInS2 Quantum Dot Solar Cells

Cited by 51 publications

References 50 publications

Vapor transport deposition of antimony selenide thin film solar cells with 7.6% efficiency

Vapor transport deposition of antimony selenide thin film solar cells with 7.6% efficiency

A Small‐Molecule “Charge Driver” enables Perovskite Quantum Dot Solar Cells with Efficiency Approaching 13%

Advancing colloidal quantum dot photovoltaic technology

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