Journal
ACS ENERGY LETTERS
Volume 2, Issue 12, Pages 2667-2673Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00888
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2015R1A2A1A10054230]
- DONGJIN SEMICHEM Scholarship Foundation
- National Research Foundation of Korea [2015R1A2A1A10054230] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Understanding and controlling interfacial charge transfer at the heterojunction of optoelectronic devices is currently receiving extensive interest. Here, we study the parameters that can influence the electron extraction in planar perovskite solar cells (P-PSCs) using spin-coated SnO2 and TiO2, anodized-TiO2 (a-TiO2), and bilayered electron transport layers (ETL) composed of SnO2 and TiO2 or SnO2 on a-TiO2 (SnO2@a-TiO2). These are the varied free energy difference (Delta G) values between the ETL and perovskites, electron mobility (mu(e)) of the ETL, and quality of physical contact between the ETL and fluorine-doped tin oxide (FTO). Among the various ETLs, the bilayered ETL (SnO2@a-TiO2) gives a large Delta G as well as defect-free physical contact. The resulting P-PSC exhibits a PCE of 21.1% and stabilized efficiency of 20.2% with reduced hysteresis. This result emphasizes that a large free energy difference (Delta G) value plays an important role in electron extraction. More importantly, the defect-free physical contact is also crucial for achieving improved electron extraction.
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