期刊
RSC ADVANCES
卷 8, 期 24, 页码 13094-13102出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra01481g
关键词
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资金
- Spanish Ministry of Economy, Industry and Competitiveness (MEIC) [TEC2015-71915-REDT, TEC2015-71324-R]
- ICREA
- Catalan authority [AGAUR 2017 SGR 1527]
- CONACYT in Mexico [237213]
- Project Catedras CONACYT para Jovenes Investigadores
In this paper, we demonstrate that zinc oxide (ZnO) layers deposited by inkjet printing (IJP) can be successfully applied to the low-temperature fabrication of efficient inverted polymer solar cells (i-PSCs). The effects of ZnO layers deposited by IJP as electron transport layer (ETL) on the performance of i-PSCs based on PTB7-Th:PC70BM active layers are investigated. The morphology of the ZnO-IJP layers was analysed by AFM, and compared to that of ZnO layers deposited by different techniques. The study shows that the morphology of the ZnO underlayer has a dramatic effect on the band structure and non-geminate recombination kinetics of the active layer deposited on top of it. Charge carrier and transient photovoltage measurements show that non-geminate recombination is governed by deep trap states in devices made from ZnO-IJP while trapping is less significant for other types of ZnO. The power conversion efficiency of the devices made from ZnO-IJP is mostly limited by their slightly lower J(SC), resulting from non-optimum photon conversion efficiency in the visible part of the solar spectrum. Despite these minor limitations their J-V characteristics compare very favourably with that of devices made from ZnO layer deposited using different techniques.
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