Limiting factor of performance for solution-phase ligand-exchanged PbS quantum dot solar cell

Fukuda, Tsuguo; Takahashi, Akihiro; Takahira, Kazuya; Wang, Haibin; Kubo, Takaya; Segawa, Hiroshi

doi:10.1016/j.solmat.2019.03.011

“…[120,121] Although a large variety of surface chemistry treatments such as ligands exchanges have been developed to improve the optoelectronic properties of PbX QDs, these approaches may also produce suspended bonds, thus causing high defect density on its surface. [122][123][124] Consequently, PbX QDs usually suffer from relatively high voltage loss and need high-quality surface passivation when applied in solar cells. [125][126][127] Conversely, PVK QDs show a distinctly high defect tolerance.…”

Section: Defect Tolerancementioning

confidence: 99%

“…a) Progress in the PCE and the accumulated publication numbers of lead‐based QD solar cells since 2010. [ 88–148 ] The data of the number of publications is taken from Scopus ( www.scopus.com). b) Schematic diagram of the material structure of PbX (X = S, Se) (Reproduced with permission.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dots for Photovoltaics: A Tale of Two Materials

Duan

¹

,

Hu

²

,

Guan

³

et al. 2021

Advanced Energy Materials

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solar cells (PSCs), and colloidal quantum dots (QDs) solar cells, have been quickly developed. [3][4][5][6][7][8][9][10][11] Among these diverse PV materials, QDs possess unique nanostructural uniformity and highly tunable features, including quantum confinement effects and multiple exciton generation (MEG). [12][13][14][15][16][17] QD solar cells can be fabricated as semitransparent and flexible for promising applications, such as, wearable energy collectors and building-integrated photovoltaics. [18,19] QDs are defined as nanometer-sized semiconducting crystals, usually chemically synthesized with surface ligands. [20,21] When the size of a semiconducting crystal reduces to the molecular scale, its bulk properties alter simultaneously. [22,23] Owing to the quantum confinement effect, the absorption spectra and energy levels of QDs can be easily tuned by size variation. For example, the bandgap of cadmium telluride (CdTe) bulk material is around 1.48 eV, while the bandgap of the CdTe QD can be tuned from 2.06 to 2.32 eV by a slight size reduction from 2.47 to 2.10 nm. [24,25] The quantum confinement effect also allows better energy level and absorption matching for QD-based optoelectronic devices such as photodetectors, light-emitting diodes, and solar cells. [26][27][28][29][30][31][32][33][34] Additionally, QDs enable hot cattier extraction due to the MEG effect, where one absorbed photon with high energy may generate two or more excitons. [27,35,36] The unique capability of MEG in QD solar cells can potentially improve the power conversion efficiency (PCE) of single-junction devices and thus overcome the Shockley-Queisser (SQ) PCE limit. [37][38][39] In the past decades, increasing research attention has been paid to QD solar cells, and many materials have been exploited in this context. Although there have been some trials on leadfree materials, such as Indium arsenide (InAs), InP, and AgBiS 2 , their device performances are still poor, with PCE less than 6%. [40][41][42][43][44][45] Up to now, most of the high-performance devices were reported from lead-based QDs in two main categories: lead chalcogenides (PbX, X = S, Se) and lead halide perovskites (PVK). Figure 1a depicts the progress in PCE values and accumulated publication numbers of lead-based QD solar cells, shown as points and columns, respectively, since 2010. With recent progress in device structure design, band-alignment engineering, and optimized surface passivation, the PCE of QD solar cells has constantly increased, achieving a record of 16.6% to date. [46][47][48] Before 2016, QD solar cells were mainly composed of PbX (X = S, Se), and continuous efforts have recently culminated in a remarkable PCE of 13.8%. [53][54][55] PbX usually crystallizes in a cubic structure with S or Se atoms located at octahedral Quantum dot (QD) solar cells, benefiting from unique quantum confinement effects and multiple exciton generation, have attracted great research attention in the past decades. Before 2016, research efforts were mainly devoted to solar cells ...

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“…We recently reported a sensitized thermal cell (STC) that is a new thermal energy conversion system [6][7][8][9][10][11] , which was inspired by the concept of a dye-sensitized thermal cell (DSSC). [12][13][14][15][16] Utilising STCs, electric power can be generated "directly" from heat via the redox reactions of electrolyte ions with thermally excited carriers in semiconductors (Fig. 1).…”

Section: Main Textmentioning

confidence: 99%

Power Generation at Room Temperature

Kohata

¹

,

Obinata

²

,

Ikeda

³

et al. 2021

Preprint

0

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The effective utilisation of thermal energy is crucial to a world aiming at sustainable development goals. The sensitised thermal cell (STC) is a new thermal energy conversion technology, which was reported in 2017, for generating electricity via the redox reactions of electrolyte ions with thermally excited carriers in semiconductors. STC is attracting attention as a technology that could affect oil prices globally. Here, we report the successful construction of STC, which discharges and recovers well at room temperature, by studying the interelectrode and ion diffusion distances. The fabricated STC is thinner than 0.5 mm and can be rendered flexible. Further, STCs, which possess a power generation capacity of 0.1 microA, 100 mV per 1 mm2 area, and shall be installed “in” internet-of-things (IoT) devices, drainage pipes, and walls in the future.

show abstract

“…We recently reported a sensitized thermal cell (STC) that is a new thermal energy conversion system [6][7][8][9][10][11] , which was inspired by the concept of a dye-sensitized thermal cell (DSSC). [12][13][14][15][16] Utilising STCs, electric power can be generated "directly" from heat via the redox reactions of electrolyte ions with thermally excited carriers in semiconductors (Fig. 1).…”

Section: Main Textmentioning

confidence: 99%

Power Generation at Room Temperature -How to Design of the Sensitized Thermal Cell-

Kohata

¹

,

Obinata

²

,

Ikeda

³

et al. 2021

Preprint

0

View full text Add to dashboard Cite

The effective utilisation of thermal energy is crucial to a world aiming at sustainable development goals. The sensitised thermal cell (STC) is a new thermal energy conversion technology, which was reported in 2017, for generating electricity via the redox reactions of electrolyte ions with thermally excited carriers in semiconductors. STC is attracting attention as a technology that could affect oil prices globally. Here, we report the successful construction of STC, which discharges and recovers well at room temperature, by studying the interelectrode and ion diffusion distances. The fabricated STC is thinner than 0.5 mm and can be rendered flexible. Further, STCs, which possess a power generation capacity of 0.1 microA, 100 mV per 1 mm2 area, and shall be installed “in” internet-of-things (IoT) devices, drainage pipes, and walls in the future.

show abstract

Limiting factor of performance for solution-phase ligand-exchanged PbS quantum dot solar cell

Cited by 30 publications

References 45 publications

Quantum Dots for Photovoltaics: A Tale of Two Materials

Quantum Dots for Photovoltaics: A Tale of Two Materials

Power Generation at Room Temperature

Power Generation at Room Temperature -How to Design of the Sensitized Thermal Cell-

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