期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131831
关键词
Perovskite solar cells; Anatase TiO2 NPs; Low-temperature process; 3D electromagnetic simulations
资金
- Tokai University General Research Organization
- Research Grants Council of Hong Kong, China [152093/18E, 11210218]
- DANA IMPAK PERDANA (DIP) grant from Universiti Kebangsaan Malaysia (UKM) [DIP-2018-007]
- Innovation and Technology Commission of Hong Kong [ITS/461/18, GHP/040/19SZ]
- [20H02838]
This study investigates the preparation and optimization of low-temperature TiO2 film as an electron transport layer for high-performance PSCs. The high-quality TiO2 film improves the power conversion efficiency of PSCs, and further enhancement in device performance is achieved through nanophotonic design.
We report on the preparation and optimization of low temperature (<200 degrees C) processed TiO2 film as an electron transport layer (ETL) for high-performance perovskite solar cells (PSCs) compatible with flexible substrates. A high-quality ETL is spin-coated from hydrothermal synthesized single-phase crystalline anatase TiO2 nano particles (NPs) with an average diameter of 6 similar to 10 nm. The surface of the high crystallite TiO2 NPs reveals a tendency toward interparticle necking, facilitating compact scaffolds, resulting in PSCs with high power conversion efficiencies (PCEs). The influence of low and high temperature treated TiO2 ETL on the device performance is studied. The best planar device fabricated in superstrate configuration (sup-C) exhibits a PCE of 17.1% with a J(SC) of 20.3 mA/cm(2). The PCE can be increased by similar to 25%, up to 23%, by moving from planar architecture in sup-C to the textured solar cell in substrate configuration (sub-C). The PSC covered with a nanophotonicstructured front contact allows gaining 8% and 15% on V-OC and J(SC), respectively, where 2/3 of J(SC) gain is attributed to improved light incoupling, while the remaining 1/3 is due to increased diffraction at long wavelengths. The optical and electrical characteristics of the devices are investigated by 3D finite-domain time domain (FDTD) and finite element method (FEM) rigorous simulations. Detailed guidelines on the nanophotonic design are provided.
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