An energy-harvesting scheme employing CuGaSe2 quantum dot-modified ZnO buffer layers for drastic conversion efficiency enhancement in inorganic–organic hybrid solar cells

Ho, Cherng Rong; Tsai, Meng Lin; Jhuo, Hung Jun; Lien, Der Hsien; Lin, Chieh-An; Tsai, Shin Hung; Wei, Tzu Chiao; Huang, Kun-Ping; Chen, Show An; He, Jr Hau

doi:10.1039/c3nr34155k

Cited by 15 publications

(12 citation statements)

References 43 publications

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“…Among the LDS materials, QDs have been intensively investigated in recent years due to their attractive optical properties. The QDs are nanosized semiconductor materials with wide absorption and narrow emission bands, high quantum yield, and a bandgap that is tunable by changing their size. − Various QDs, including CdS, − CdSe, ZnSe, CuGaSe 2 , graphene, − CdSe/ZnS, − CdZnS/ZnS, , and CuInS 2 /ZnS have been utilized as LDS materials in several types of solar cells and their performance improvements have been reported, as shown in Table . QDs with different photoluminescence (PL) peaks have been studied for LDS materials for silicon and GaAs solar cells .…”

Section: Introductionmentioning

confidence: 99%

Ultrawide Spectral Response of CIGS Solar Cells Integrated with Luminescent Down-Shifting Quantum Dots

Jeong¹,

Kim²,

Lee³

et al. 2017

ACS Appl. Mater. Interfaces

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Conventional Cu(In,Ga)Se (CIGS) solar cells exhibit poor spectral response due to parasitic light absorption in the window and buffer layers at the short wavelength range between 300 and 520 nm. In this study, the CdSe/CdZnS core/shell quantum dots (QDs) acting as a luminescent down-shifting (LDS) layer were inserted between the MgF antireflection coating and the window layer of the CIGS solar cell to improve light harvesting in the short wavelength range. The LDS layer absorbs photons in the short wavelength range and re-emits photons in the 609 nm range, which are transmitted through the window and buffer layer and absorbed in the CIGS layer. The average external quantum efficiency in the parasitic light absorption region (300-520 nm) was enhanced by 51%. The resulting short circuit current density of 34.04 mA/cm and power conversion efficiency of 14.29% of the CIGS solar cell with the CdSe/CdZnS QDs were improved by 4.35 and 3.85%, respectively, compared with those of the conventional solar cells without QDs.

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Section: Introductionmentioning

confidence: 99%

Ultrawide Spectral Response of CIGS Solar Cells Integrated with Luminescent Down-Shifting Quantum Dots

Jeong¹,

Kim²,

Lee³

et al. 2017

ACS Appl. Mater. Interfaces

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“…Polymer solar cells (PSCs) are promising candidates for future photovoltaic devices [1][2][3][4][5][6][7][8] owing to their low cost of material production and device processing, low temperature processing for exible devices and ease of fabrication. 7,[9][10][11] However due to their lower lifetime and efficiency, PSCs require a deeper understanding to eradicate the aforementioned drawbacks. One of the most important parameters that inuence the charge transport and recombination dynamics in bulk heterojunction solar cells is the nanomorphology.…”

Section: Introductionmentioning

confidence: 99%

Interplay of nanoscale domain purity and size on charge transport and recombination dynamics in polymer solar cells

et al. 2014

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Charge transport and bimolecular recombination dynamics were correlated with nanomorphology in polymer solar cells. The morphology of poly(diketopyrrolopyrrole-terthiophene) (PDPP3T) and phenyl-C61-butyric acid methyl ester (PC60BM) blend films was modified using different solvent additives namely 1-chloronaphthalene (CN), 1,8-diiodooctane (DIO) and 1,8-octanedithiol (ODT) and their role on steady state and transient optoelectronic properties was investigated. The energy filtered transmission electron microscopy (EFTEM) images showed that additives (e.g. CN and DIO) improved the domain purity which leads to significantly higher short circuit current densities (Jsc). However when the cells were processed with the ODT additive, the fill factor (FF) and open circuit voltage (Voc) decreased dramatically. Films processed with the ODT additive showed a smaller domain size but were more connected compared to films processed using CN and DIO additives. Transient photocurrent analysis indicates faster charge collection in the case of CN and DIO processed solar cells and the slowest charge collection in ODT processed solar cells. Interestingly devices processed with the ODT additive also showed the longest charge carrier recombination lifetime and lowest bimolecular recombination coefficient. This is attributed to the smaller donor domains that are connected with each other to provide a more interconnected and efficient charge transport matrix but longer pathways in ODT films. Such a matrix helped the charge to escape from the donor-acceptor interfaces and thus reduces the bimolecular recombination, while the longer pathway increases the charge collection time. Further insight is provided into the selection of processing conditions to achieve an ideal active layer morphology consisting of domains with higher polymer purity and optimal size that lead to higher Jsc and FF.

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“…Especially, the surface potential at a Cs/Zn molar ratio of 0.067 was shied by À0.17 V; thus, the V OC reaches the maximum (0.633 V). The conduction band edge of ZnO is known to be 4.2 eV, 28 while the LUMO of pyridine-treated CdSe is known to be 4.0 eV. 29 Thus, the conduction band edge of ZnO:Cs with a Cs/Zn molar ratio of 0.067 is pinned to the LUMO of CdSe, as shown schematically in Fig.…”

Section: Resultsmentioning

confidence: 99%

Air-stable inverted structure of hybrid solar cells using a cesium-doped ZnO electron transport layer prepared by a sol–gel process

et al. 2013

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An energy-harvesting scheme employing CuGaSe2 quantum dot-modified ZnO buffer layers for drastic conversion efficiency enhancement in inorganic–organic hybrid solar cells

Cited by 15 publications

References 43 publications

Ultrawide Spectral Response of CIGS Solar Cells Integrated with Luminescent Down-Shifting Quantum Dots

Ultrawide Spectral Response of CIGS Solar Cells Integrated with Luminescent Down-Shifting Quantum Dots

Interplay of nanoscale domain purity and size on charge transport and recombination dynamics in polymer solar cells

Air-stable inverted structure of hybrid solar cells using a cesium-doped ZnO electron transport layer prepared by a sol–gel process

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