High performance planar p-i-n perovskite solar cells based on a thin Alq cathode buffer layer.
Lijia Chen, Gang Wang, Lianbin Niu, Yanqing Yao, Yunxia Guan, Yuting Cui, Qunliang Song
Author Information
Lijia Chen: College of Physics and Electronics Engineering, Chongqing Normal University Chongqing 401331 P. R. China.
Gang Wang: Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University Chongqing 400715 P. R. China qlsong@swu.edu.cn.
Lianbin Niu: College of Physics and Electronics Engineering, Chongqing Normal University Chongqing 401331 P. R. China.
Yanqing Yao: Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University Chongqing 400715 P. R. China qlsong@swu.edu.cn.
Yunxia Guan: College of Physics and Electronics Engineering, Chongqing Normal University Chongqing 401331 P. R. China.
Yuting Cui: College of Physics and Electronics Engineering, Chongqing Normal University Chongqing 401331 P. R. China.
Qunliang Song: Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University Chongqing 400715 P. R. China qlsong@swu.edu.cn. ORCID
As a thin cathode buffer layer (CBL) tris-(8-hydroxyquinoline), aluminum (Alq) is successfully introduced into the planar p-i-n perovskite solar cells (PSC) between the PCBM layer and cathode with a device structure of ITO/PEDOT:PSS/CHNHPbI(Cl)/PCBM/Alq/Ag. Due to the as-introduced thin Alq CBL, a high performance planar PSC has been achieved with a fill factor (FF) of 72% and maximum power conversion efficiency (PCE) of 14.22%. The PCE value is approximately 29% higher than that of the reference device without Alq CBL. Concerning the results of AC impedance spectra and transient photocurrent measurements, such a remarkable improvement of PCE is mainly attributed to the Alq-caused better charge-extraction at the cathode, which is induced by reducing charge accumulation between PCBM and Ag.
References
Science. 2016 Oct 14;354(6309):206-209
[PMID: 27708053]
ACS Appl Mater Interfaces. 2018 Mar 21;10(11):9503-9513
[PMID: 29473419]
J Am Chem Soc. 2009 May 6;131(17):6050-1
[PMID: 19366264]
