Monolithic Organic/Colloidal Quantum Dot Hybrid Tandem Solar Cells via Buffer Engineering

Kim, Hong Il; Baek, Se‐Woong; Choi, Min‐Jae; Chen, Bin; Ouellette, Olivier; Choi, Kyoungwon; Scheffel, Benjamin; Choi, Han Suk; Biondi, Margherita; Hoogland, Sjoerd; Arquer, F. Pelayo Garcı́a de; Park, Jin Young; Sargent, Edward H.

doi:10.1002/adma.202004657

Cited by 23 publications

(40 citation statements)

References 26 publications

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“…In addition to the promising results obtained using TiO 2 as an ETL layer, other transition metal oxides have been used, such as zinc oxide nanoparticles 19 , nanorods 20 and *e-mail: diego.albuquerque@msn.com thin films 11 , which can be deposited by various techniques, including magnetron sputtering.…”

Section: Introductionmentioning

confidence: 99%

SnO2/ZnO Heterostructure as an Electron Transport Layer for Perovskite Solar Cells

Albuquerque

Ramos

Ireno³

et al. 2021

Mat. Res.

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This work reports a study of the room-temperature synthesis of a SnO 2 /ZnO bilayer by magnetron sputtering. Morphological, optical, and electrical properties of the bilayer were investigated for different thicknesses of SnO 2 . Morphology was studied using profilometry and field emission scanning electron microscopy. The optical transmittances of the ZnO films and of the SnO 2 /ZnO combination were high (about 80%) in the visible, and the SnO 2 film did not alter the optical properties of the ZnO, which would act as a transparent contact electrode in a perovskite solar cell.

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Section: Introductionmentioning

confidence: 99%

SnO2/ZnO Heterostructure as an Electron Transport Layer for Perovskite Solar Cells

Albuquerque

Ramos

Ireno³

et al. 2021

Mat. Res.

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“…[ 204 ] Their fabricated devices exhibited a high PCE approaching 9% which is 2 times higher than the corresponding single‐junction device. Recently, Sargent and coworkers combined PbS QD solar cells with OSCs to fabricate organic/QD hybrid tandem devices, [ 205 ] and they demonstrated a high PCE of 13.7% for their fabricated devices with a dual NIR absorber.…”

Section: Engineering Of Quantum Dot Photovoltaic Devicesmentioning

confidence: 99%

Quantum Dots for Photovoltaics: A Tale of Two Materials

Duan

Guan

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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“…In addition to using PbS CQDs with different bandgaps, CQDs can also be combined with other absorption materials to construct tandem devices, such as, CdTe-PbS, perovskite-PbS, polymer-PbS, etc. [212][213][214] In particular, polymer-PbS CQDs hybrid tandem photovoltaics recently have achieved significant progress. [213,214] For instance, a type of highly efficient monolithically integrated hybrid tandem solar cells that combine CQDs and organic absorbers was designed, achieving a highest PCE of 13.7% for CQDbased hybrid photovoltaic device.…”

Section: Tandem Designmentioning

confidence: 99%

“…[212][213][214] In particular, polymer-PbS CQDs hybrid tandem photovoltaics recently have achieved significant progress. [213,214] For instance, a type of highly efficient monolithically integrated hybrid tandem solar cells that combine CQDs and organic absorbers was designed, achieving a highest PCE of 13.7% for CQDbased hybrid photovoltaic device. [213] In such systems, the NIR response characteristic of PbS CQDs effectively contributes to the improvement of the photocurrent level in the devices.…”

Section: Tandem Designmentioning

confidence: 99%