Performance enhancement of heterojunction ZnO/PbS quantum dot solar cells by interface engineering

Kumar, Sandeep; Upadhyay, Rohitash; Pradhan, Basudev

doi:10.1016/j.solener.2020.09.063

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…For simplicity, recombination processes that have not received much attention in recent years (interface recombination of PbS QDs and ZnO) have not been included in the simulations. Depending on the interface structure/roughness, this might lead to minor gains or losses in the overall performance, 50 but the literature does not provide reliable values that could be used in the simulations.…”

Section: Methodsmentioning

confidence: 99%

Optically Resonant Bulk Heterojunction PbS Quantum Dot Solar Cell

et al. 2022

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We design an optically resonant bulk heterojunction solar cell to study optoelectronic properties of nanostructured p−n junctions. The nanostructures yield strong light−matter interaction as well as distinct charge-carrier extraction behavior, which together improve the overall power conversion efficiency. We demonstrate high-resolution substrate conformal soft-imprint lithography technology in combination with state-of-the art ZnO nanoparticles to create a nanohole template in an electron transport layer. The nanoholes are infiltrated with PbS quantum dots (QDs) to form a nanopatterned depleted heterojunction. Optical simulations show that the absorption per unit volume in the cylindrical QD absorber layer is enhanced by 19.5% compared to a planar reference. This is achieved for a square array of QD nanopillars of 330 nm height and 320 nm diameter, with a pitch of 500 nm on top of a residual QD layer of 70 nm, surrounded by ZnO. Electronic simulations show that the patterning results in a current gain of 3.2 mA/cm 2 and a slight gain in voltage, yielding an efficiency gain of 0.4%. Our simulations further show that the fill factor is highly sensitive to the patterned structure. This is explained by the electric field strength varying strongly across the patterned absorber. We outline a path toward further optimized optically resonant nanopattern geometries with enhanced carrier collection properties. We demonstrate a 0.74 mA/cm 2 current gain for a patterned cell compared to a planar cell in experiments, owing to a much improved infrared response, as predicted by our simulations.

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Section: Methodsmentioning

confidence: 99%

Optically Resonant Bulk Heterojunction PbS Quantum Dot Solar Cell

et al. 2022

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“…[121][122][123] Meanwhile, TiO 2 NCs have been widely applied in n-i-p solar cells using chalcogenide NC as light harvesters, such as CdSe, CdS, and PbS. [124][125][126][127][128][129][130] Similarly, ZnO NCs were used as ETL for n-i-p PbS- Review Nanoscale Advances based NC-LHSCs, 30,32,35,39,40,44,45,58,[131][132][133][134][135][136][137][138][139][140][141][142][143][144][145] PSCs, 146 and OSCs. [147][148][149] SnO NCs as ETL for DSSCs, [150][151][152][153][154][155][156] for OSCs, [157][158][159] and for PSCs, 173 NCs have been used as IFL for NC-LHSCs,…”

Section: Recent Advances Of Nc Etlmentioning

confidence: 99%

Nanocrystals as performance-boosting materials for solar cells

Yang,

Cang,

et al. 2024

Nanoscale Adv.

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“…After a short interval of time (generally in the order of ps to ns), the electrons from the conduction bands (or from any other possible interband) returns to the ground state by emitting photons. In general, the time dependence of the emission rate can be modelled with eqn (7):…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…5 Among the various candidates available for MEG, PbS nanocrystals are especially considered as promising ones due to their large excitonic Bohr radius (B18 nm), tuneable band gap (E g ), easily controllable morphology and low fabrication cost. [6][7][8][9][10] As D49.4% of solar energy falls within the infrared region, PbS nanocrystals have previously been used as an additive for solar cells, [11][12][13][14][15][16] to effectively collect the solar energy. Despite the usage of PbS in conventional Schottky barrier solar cells 17 and sensitizers 18 in perovskite solar cells, the carrier dynamics in PbS have not yet been deeply understood enough to implement it as an active layer in HCSC.…”

Section: Introductionmentioning

confidence: 99%