DONOR-ACCEPTOR TYPE BULK NANO-HETEROJUNCTION SOLAR CELL DESIGNS BASED ON ELECTRONICALLY COUPLED LEAD SELENIDE NANORODS AND LEAD SELENIDE QUANTUM DOTS

Download
2022-7-22
Kolay, İrem
Multiple exciton generation (MEG) process has received a great deal of attention in solar energy research due to its high potential in improving photocurrent. In this respect, PbSe NRs are considered as one of the most promising candidates due to their remarkable MEG yield. However, limited number of solar cell studies based on PbSe NRs and their poor performances have been limiting their utilization in photovoltaic (PV) technologies. In this thesis, previously introduced solar cell design, where covalently bonded PbSe QDs and PbSe NRs in a BNHJ layer were utilized as light absorbing layer, were further optimized and the direct roles of solar cell components and processing conditions are disclosed for the first time in literature. High quality QDs and NRs with low polydispersity were synthesized with hot injection method and characterized by techniques such as UV-Vis spectroscopy, TEM and UPS. Solar cells with inverted architecture were fabricated and characterized by I-V and EQE techniques. Performance of the solar cells was enhanced by optimizing the cell components such as light absorbing active layer, electron transport and hole transport layers. Optimization of the thicknesses of the active and electron transport layers, and heat treatment were found to be the key factors for improving the performance of the solar cells in terms of PCE and EQE/IQE values at energies where the MEG is expected to take place. Additionally, we found that the type of the HTL has a profound affect in cell performance. In this sense, PbSe QDs with 1.4 eV band gap, PbS QDs with 1.3 eV band gap and TIPSPentacene molecule were utilized as HTLs. We found that PbSe QDs with 1.4 eV band, gap leads to the best performing cells. Furthermore, we found that the structure of the ligand that holds NRs and QDs together in BNHJ layer has a drastic affect in cell performance. The optimized BNHJ devices lead to the best performing cells comprising PbSe NRs in literature; >100% EQE/IQE and 4.09% PCE.

Suggestions

Dual-band perfect metamaterial absorber for solar cell applications
Rufangura, Patrick; Sabah, Cumali (2015-10-01)
The efficiency of solar photovoltaic (PV) cells has been one of the major problems impeding its global adoption as one of the sustainable substitutes to fossil fuel based technologies. Metamaterial (MTM) based solar cells offer an opportunity towards increasing the system efficiency by enhancing the total absorbed solar radiation incident on this device. In this study, a nanostructure-based MTM perfect absorber has been designed and simulated. By adjusting geometrical parameters and MTM structure properties...
Analytical Modelling, Simulation and Comparative Study of Multi-Junction Solar Cells Efficiency
Hadjdida, Abdelkader; Bourahla, Mohamed; Ertan, Hulusi Bülent; Bekhti, Mohamed (2018-12-01)
Currently, solar energy is promising the primary source of renewable energy that has a great potential to generate power for an extremely low operating cost when compared to already existing power generation technologies. Increasing the efficiency of solar cells is a major goal and the prominent factor in photovoltaic system research. Current triple junction solar cells reach 30% and the next generation will bring 35% in 5 years to peak at 40%. These cells are used in space environment and in terrestrial sy...
Multiband Metamaterial Absorber Design Based on Plasmonic Resonances for Solar Energy Harvesting
Mulla, Batuhan; Sabah, Cumali (2016-10-01)
A new metamaterial absorber is designed and characterized numerically for the harvesting of solar energy. The design is composed of three layers in which the interaction among them gives rise to the plasmonic resonances. The main operation frequency range of the proposed structure is chosen to be the visible regime. However, the design is also analyzed for the infrared and ultraviolet regimes. In order to characterize the absorber, some parametric studies with respect to the dimensions of the structure are ...
Hybrid Vapor-Solution Sequentially Deposited Mixed-Halide Perovskite Solar Cells
Soltanpoor, Wiria; Dreessen, Chris; Şahiner, Mehmet Cem; Susic, Isidora; Afshord, Amir Zarean; Chirvony, Vladimir S.; Boix, Pablo P.; Günbaş, Emrullah Görkem; Yerci, Selçuk; Bolink, Henlk J. (2020-08-01)
The recent sky-rocketing performance of perovskite solar cells has triggered a strong interest in further upgrading the fabrication techniques to meet the scalability requirements of the photovoltaic industry. The integration of vapor deposition into the solution process in a sequential fashion can boost the uniformity and reproducibility of the perovskite solar cells. In addition, mixed-halide perovskites have exhibited outstanding crystallinity and higher stability compared with iodide-only perovskite. An...
NOVEL HOLE TRANSPORT, LARGE AMMONIUM CATION and DOPANT MATERIALS FOR REALIZATION OF HIGH-PERFORMANCE PEROVSKITE SOLAR CELLS
Bağ Çelik, Esra; Günbaş, Emrullah Görkem; Yerci, Selçuk; Department of Polymer Science and Technology (2023-2-24)
Perovskite solar cells (PSCs) have been widely studied for their potential to revolutionize the solar energy industry. Unfortunately, the commercialization of PSCs remains challenging due to the limitation of high-performance, low-cost, and environmentally stable organic hole-transport materials (HTMs). For this reason, the development of a new generation HTMs is strongly anticipated. Hole transport material (HTM) is one of the critical components in perovskite solar cells, which is responsible for transpor...
Citation Formats
İ. Kolay, “DONOR-ACCEPTOR TYPE BULK NANO-HETEROJUNCTION SOLAR CELL DESIGNS BASED ON ELECTRONICALLY COUPLED LEAD SELENIDE NANORODS AND LEAD SELENIDE QUANTUM DOTS,” M.S. - Master of Science, Middle East Technical University, 2022.