Efficient Bulk Heterojunction CH3NH3PbI3-TiO2Solar Cells with TiO2Nanoparticles at Grain Boundaries of Perovskite by Multi-Cycle-Coating Strategy

doi:10.1021/acsami.7b02323

SIC OpenIR

	Efficient Bulk Heterojunction CH3NH3PbI3-TiO2Solar Cells with TiO2Nanoparticles at Grain Boundaries of Perovskite by Multi-Cycle-Coating Strategy
	Shao, Jun 1,2; Yang, Songwang 1; Liu, Yan 1
	2017
Source Publication	ACS Applied Materials and Interfaces
ISSN	19448244
Volume	9 Issue:19 Pages:16202-16214
Abstract	A novel bulk heterojunction (BHJ) perovskite solar cell (PSC), where the perovskite grains act as donor and the TiO2nanoparticles act as acceptor, is reported. This efficient BHJ PSC was simply solution processed from a mixed precursor of CH3NH3PbI3(MAPbI3) and TiO2nanoparticles. With dissolution and recrystallization by multi-cycle-coating, a unique composite structure ranging from a MAPbI3-TiO2-dominated layer on the substrate side to a pure perovskite layer on the top side is formed, which is beneficial for the blocking of possible contact between TiO2and the hole transport material at the interface. Scanning electron microscopy clearly shows that TiO2nanoparticles accumulate along the grain boundaries (GBs) of perovskite. The TiO2nanoparticles at the GBs quickly extract and reserve photogenerated electrons before they transport into the perovskite phase, as described in the multitrapping model, retarding the electron-hole recombination and reducing the energy loss, resulting in increased VOCand fill factor. Moreover, the pinning effect of the TiO2nanoparticles at the GBs from the strong bindings between TiO2and MAPbI3suppresses massive ion migration along the GBs, leading to improved operational stability and diminished hysteresis. Photoluminescence (PL) quenching and PL decay confirm the efficient exciton dissociation on the heterointerface. Electrochemical impedance spectroscopy and open-circuit photovoltage decay measurements show the reduced recombination loss and improved carrier lifetime of the BHJ PSCs. This novel strategy of device design effectively combines the benefits of both planar and mesostructured architectures whilst avoiding their shortcomings, eventually leading to a high PCE of 17.42% under 1 Sun illumination. The newly proposed approach also provides a new way to fabricate a TiO2-containing perovskite active layer at a low temperature. © 2017 American Chemical Society.
DOI	10.1021/acsami.7b02323
EI Accession Number	20172203700193
EI Keywords	Nitrogen compounds
EI Classification Number	482.2 Minerals - 525.4 Energy Losses (industrial and residential) - 641.1 Thermodynamics - 701.1 Electricity: Basic Concepts and Phenomena - 702.3 Solar Cells - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology - 801 Chemistry - 804.2 Inorganic Compounds - 813.2 Coating Materials - 933 Solid State Physics
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Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/25879
Collection	中国科学院上海硅酸盐研究所
Affiliation	1.CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 588 Heshuo Road, Shanghai; 201899, China; 2.University of Chinese Academy of Sciences, Beijing; 100039, China
Recommended Citation GB/T 7714	Shao, Jun,Yang, Songwang,Liu, Yan. Efficient Bulk Heterojunction CH3NH3PbI3-TiO2Solar Cells with TiO2Nanoparticles at Grain Boundaries of Perovskite by Multi-Cycle-Coating Strategy[J]. ACS Applied Materials and Interfaces,2017,9(19):16202-16214.
APA	Shao, Jun,Yang, Songwang,&Liu, Yan.(2017).Efficient Bulk Heterojunction CH3NH3PbI3-TiO2Solar Cells with TiO2Nanoparticles at Grain Boundaries of Perovskite by Multi-Cycle-Coating Strategy.ACS Applied Materials and Interfaces,9(19),16202-16214.
MLA	Shao, Jun,et al."Efficient Bulk Heterojunction CH3NH3PbI3-TiO2Solar Cells with TiO2Nanoparticles at Grain Boundaries of Perovskite by Multi-Cycle-Coating Strategy".ACS Applied Materials and Interfaces 9.19(2017):16202-16214.

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