Hybrid Tandem Quantum Dot/Organic Solar Cells with Enhanced Photocurrent and Efficiency via Ink and Interlayer Engineering

Kim, Taesoo; Firdaus, Yuliar; Kirmani, Ahmad R.; Liang, Ru‐Ze; Hu, Hanlin; Liu, Mengxia; Labban, Abdulrahman El; Hoogland, Sjoerd; Beaujuge, Pierre M.; Sargent, Edward H.; Amassian, Aram

doi:10.1021/acsenergylett.8b00460

Cited by 41 publications

(53 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[9] Several research groups have recently reported various types of CQD-based hybrid tandem solar cells (TSCs). [9][10][11][12][13][14][15][16][17] However, previously reported hybrid TSCs have limitations in improving the PCE. In the case of CQD/CQD-based TSCs, the intrinsic low V OC of CQD limits the PCE.…”

Section: Doi: 101002/adma202004657mentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

Monolithically integrated hybrid tandem solar cells (TSCs) that combine solution‐processed colloidal quantum dot (CQD) and organic molecules are a promising device architecture, able to complement the absorption across the visible to the infrared. However, the performance of organic/CQD hybrid TSCs has not yet surpassed that of single‐junction CQD solar cells. Here, a strategic optical structure is devised to overcome the prior performance limit of hybrid TSCs by employing a multibuffer layer and a dual near‐infrared (NIR) absorber. In particular, a multibuffer layer is introduced to solve the problem of the CQD solvent penetrating the underlying organic layer. In addition, the matching current of monolithic TSCs is significantly improved to 15.2 mA cm−2 by using a dual NIR organic absorber that complements the absorption of CQD. The hybrid TSCs reach a power conversion efficiency (PCE) of 13.7%, higher than that of the corresponding individual single‐junction cells, representing the highest efficiency reported to date for CQD‐based hybrid TSCs.

show abstract

Section: Doi: 101002/adma202004657mentioning

confidence: 99%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sufficient air‐storage stability and photostability of CQD photovoltaic devices (CQDPVs) have been demonstrated, retaining ≈80% of initial performance after 1000 h of continuous illumination . Moreover, constructing tandem devices with other photoactive layers that can compensate for absorption of CQDs has been frequently suggested to further improve the PCE of CQDPVs …”

Section: Introductionmentioning

confidence: 99%

“…Tandem devices with sub‐cells possessing either identical bandgaps or complementary bandgaps have improved photon absorption in terms of intensity or bandwidth. Both CQD/CQD and CQD/organic tandem structured devices have been reported; thus, the hybrid tandem device with PbS‐CQD as the front sub‐cell and polythieno[3,4‐ b ]‐thiophene‐ co ‐benzodithiophene (PTB7)/[6,6]‐phenyl‐C 60 ‐butyric acid methyl ester (PC 61 BM) bulk heterojunction (BHJ) as the back sub‐cell have demonstrated the highest PCE of ≈9.4% . However, a significant portion of the NIR regime was still not used, which was the major reason only a marginal PCE improvement, compared to CQD single‐junction devices, was attained in the hybrid tandem devices.…”

Section: Introductionmentioning

confidence: 99%

Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions

Aqoma

Imran

Mubarok

et al. 2020

Advanced Energy Materials

View full text Add to dashboard Cite

While colloidal quantum dot photovoltaic devices (CQDPVs) can achieve a power conversion efficiency (PCE) of ≈12%, their insufficient optical absorption in the near‐infrared (NIR) regime impairs efficient utilization of the full spectrum of visible light. Here, high‐efficiency, solution‐processed, hybrid series, tandem photovoltaic devices are developed featuring CQDs and organic bulk heterojunction (BHJ) photoactive materials for front‐ and back‐cells, respectively. The organic BHJ back‐cell efficiently harvests the transmitted NIR photons from the CQD front‐cell, which reinforces the photon‐to‐current conversion at 350–1000 nm wavelengths. Optimizing the short‐circuit current density balance of each sub‐cell and creating a near ideal series connection using an intermediate layer achieve a PCE (12.82%) that is superior to that of each single‐junction device (11.17% and 11.02% for the CQD and organic BHJ device, respectively). Notably, the PCE of the hybrid tandem device is the highest among the reported CQDPVs, including single‐junction devices and tandem devices. The hybrid tandem device also exhibits almost negligible degradation after air storage for 3 months. This study suggests a potential route to improve the performance of CQDPVs by proper hybridization with NIR‐absorbing photoactive materials.

show abstract

“…[1] Therefore, as-synthesized QDs need to undergo ligand-exchange reactions to replace the long-chain ligands with short-chain ligands before incorporation into solar cells, such as replacing oleic acid with smaller molecules. [25,26] There are two primary and widely used methods for ligand exchange: solution-phase ligand exchange [27][28][29] and solid-state ligand exchange. [29,30] Generally, small and short-chain bifunctional molecules (e. g., cysteine (CYS), thioglycolic acid (TGA), 1,2-Ethanedithiol (EDT), or 3mercaptopropionic acid (3-MPA)) are the preferred ligands for QD PV studies.…”

Section: Introductionmentioning

confidence: 99%

Sensitization of SnO₂ Single Crystals with Multidentate‐Ligand‐Capped PbS Colloid Quantum Dots to Enhance the Photocurrent Stability

Yang

Kubie

et al. 2020

ChemNanoMat

View full text Add to dashboard Cite

A PbS quantum dot (QD) sensitized SnO2 solar cell has the advantage of producing photocurrent from near‐infrared to the ultraviolet that covers much of the higher energy solar spectrum. However, the long‐chain ligands, that are frequently used to cap as‐synthesized QDs, inhibit the charge transfer ability to the sensitized substrate, decreasing the photovoltaic efficiency in the device. Herein, we present a fast and efficient ligand‐exchange strategy for the replacement of synthetically convenient hydrophobic oleic acid (OA) ligands with short‐chain multidentate hydrophilic ligands such as meso‐2,3‐dimercaptosuccinic acid (DMSA) that increase the electronic coupling to the SnO2 substrate. Results from ultraviolet‐visible‐near‐infrared (UV‐Vis‐NIR) spectroscopy, X‐ray diffraction (XRD) measurements, and high‐resolution transmission electron microscopy (HR‐TEM) micrographs verify that this ligand‐exchange method produces no significant QD size or crystal‐structure changes. X‐ray photon spectra (XPS) results suggest that thiol groups from DMSA are likely bound to the PbS QDs compared to other bifunctional ligands. The PbS QDs sensitized SnO2 single crystals were characterized with atomic force microscopy (AFM), and with incident photon current efficiency (IPCE) spectra. Furthermore, it was shown that the IPCE of DMSA‐capped PbS QDs sensitized SnO2 single crystals retains >80% of its initial value after >7 hours of illumination within an electrolyte containing a high concentration of NaI whereas other ligand capped PbS QDs degraded much more rapidly.

show abstract

Hybrid Tandem Quantum Dot/Organic Solar Cells with Enhanced Photocurrent and Efficiency via Ink and Interlayer Engineering

Cited by 41 publications

References 48 publications

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

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

Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions

Sensitization of SnO₂ Single Crystals with Multidentate‐Ligand‐Capped PbS Colloid Quantum Dots to Enhance the Photocurrent Stability

Contact Info

Product

Resources

About

Hybrid Tandem Quantum Dot/Organic Solar Cells with Enhanced Photocurrent and Efficiency via Ink and Interlayer Engineering

Cited by 41 publications

References 48 publications

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

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

Efficient Hybrid Tandem Solar Cells Based on Optical Reinforcement of Colloidal Quantum Dots with Organic Bulk Heterojunctions

Sensitization of SnO2 Single Crystals with Multidentate‐Ligand‐Capped PbS Colloid Quantum Dots to Enhance the Photocurrent Stability

Contact Info

Product

Resources

About

Sensitization of SnO₂ Single Crystals with Multidentate‐Ligand‐Capped PbS Colloid Quantum Dots to Enhance the Photocurrent Stability