Journal
ADVANCED MATERIALS
Volume 32, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906374
Keywords
electron transport layers; planar perovskite solar cells; red-carbon quantum dots; SnO2; synchrotron-based GIXRD
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Funding
- National Key Research and Development Program of China [2017YFA0403400, 2017YFB0701902, 2015CB932200]
- National Natural Science Foundation of China [11675252, 11605278, 11705271, U1632265, 51602149, 61705102]
- Shanghai Sailing Program [17YF1423700]
- Chinese Academy of Sciences [XDA02040200]
- Science Foundation of China University of Petroleum [2462019QNXZ02, 2462018BJC004]
- Young 1000 Talents Global Recruitment Program of China
- Six talent peaks Project in Jiangsu Province, China
- One Hundred Talents Project of the Chinese Academy of Sciences
- Jiangsu Specially-Appointed Professor program
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An efficient electron transport layer (ETL) plays a key role in promoting carrier separation and electron extraction in planar perovskite solar cells (PSCs). An effective composite ETL is fabricated using carboxylic-acid- and hydroxyl-rich red-carbon quantum dots (RCQs) to dope low-temperature solution-processed SnO2, which dramatically increases its electron mobility by approximate to 20 times from 9.32 x 10(-4) to 1.73 x 10(-2) cm(2) V-1 s(-1). The mobility achieved is one of the highest reported electron mobilities for modified SnO2. Fabricated planar PSCs based on this novel SnO2 ETL demonstrate an outstanding improvement in efficiency from 19.15% for PSCs without RCQs up to 22.77% and have enhanced long-term stability against humidity, preserving over 95% of the initial efficiency after 1000 h under 40-60% humidity at 25 degrees C. These significant achievements are solely attributed to the excellent electron mobility of the novel ETL, which is also proven to help the passivation of traps/defects at the ETL/perovskite interface and to promote the formation of highly crystallized perovskite, with an enhanced phase purity and uniformity over a large area. These results demonstrate that inexpensive RCQs are simple but excellent additives for producing efficient ETLs in stable high-performance PSCs as well as other perovskite-based optoelectronics.
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