期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 12, 页码 14590-14598出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03213
关键词
perovskite solar cell; PEDOT:PSS; TEOS; siloxane; reduction; hole extraction
资金
- Japan Science and Technology Agency (JST), ERATO
- Adachi Molecular Exciton Engineering Project (JST ERATO) [JPMJER1305]
- Samco Foundation
- Iketani Science and Technology Foundation
- Murata Science Foundation
- Iwatani Naoji Foundation
- JSPS KAKENHI [20H02817]
- Grants-in-Aid for Scientific Research [20H02817] Funding Source: KAKEN
By adding tetraethoxysilane (TEOS) into a water-based PEDOT:PSS solution, a siloxane-blended HTL layer was successfully prepared to suppress the MAI-induced reducing reaction and enhance the performance of PSCs.
In inverted architectures of perovskite solar cells (PSCs), poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been widely used as the hole transport layer (HTL). An issue occurring in such PSCs is that the hole transport level of PEDOT:PSS shifts upward since methylammonium iodide (MAI) used for the perovskite structure organization interacts with the underlying PEDOT:PSS HTL as a reducing agent, which impedes hole extraction and therefore lowers the performance of PSCs. To overcome this issue, we demonstrate a way of adding tetraethoxysilane (TEOS) into a water-based PEDOT:PSS solution. The HTL spin-coated from the solution contains PEDOT:PSS, which is blended with siloxanes because the polymerization of TEOS takes place via the hydrolysis reaction. This siloxane blending suppresses the MAI-induced reducing reaction and upward energy-level shift of PEDOT:PSS. Using the siloxane-blended PEDOT:PSS HTL in PSCs leads a similar to 1.3-fold increase in power conversion efficiencies of iodide-based PSCs from the original similar to 10.58% to similar to 13.65%.
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