High crystalline quality perovskite thin films prepared by a novel hybrid evaporation/CVD Technique

Yanke Peng, Gaoshan Jing, Tianhong Cui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Performance of a perovskite based solar cell is highly determined by the crystalline qualities of the perovskite thin film sandwiched between an electron and a hole transport layer, such as grain size and uniformity of the film. Here, we demonstrated a new hybrid physical- chemical vapor deposition (HPCVD) technique to synthesis high quality perovskite films. First, a Pbh precursor film was spin-coated on a mesoporous TiC>2 (m-TiC^/compact TiCh (c- Ti02)/FT0 substrate in ambient environment. Then, purified CH3NH3I crystal material was evaporated and the vapor reacted with the Pbh precursor film in a vacuum pressure/temperature accurately controlled quartz tube furnace. In this technique, high vacuum (2mTorr) and low temperature (100°C) were applied to decrease perovskite film growth rate and reduce perovskite film defects. After vapor reaction, the perovskite film was annealed at 100°C for lOmin in 20mTorr vacuum to recrystallize and remove CH3NH3I residue in order to further improve crystal quality of the thin film. Crystal quality of this perovskite thin film was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray diffraction (XRD). SEM and AFM results illustrate perovskite thin films synthesized by this technique have larger grain sizes and more uniformity (RMS 11,6nm/Ra 9.3nm) superior to most existing methods. Strong peaks shown in the XRD chart at 14.18°, 28.52°, 31.96°, which were assigned to (110), (220), (330) miller indices of CH3NH3PM3 perovskite crystal, indicate the complete reaction between CH3NH3I vapor and Pbh precursor layer. High power conversion efficiency (PCE) up to 12.3% and stable efficiencies under four hours illumination of AM 1.5 standard were achieved by these solar cells. This vacuum/vapor based technique is compatible with conventional semiconductor fabrication techniques and high quality perovskite film could be achieved through delicate process control. Eventually, perovskite based solar cells could be mass produced in low cost for large scale applications by this novel technique.

Original languageEnglish (US)
Title of host publicationRecent Advances in Photovoltaics
EditorsMarkus Gloeckler, Jean V. Manca, Tingkai Li, Ivan Mora-Sero, Akira Yamada, Tsutomu Miyasaka, Yanfa Yan, Jin Young Kim, Koen Vandewal, Kai Zhu, Qi Wang, Ayodhya N. Tiwari, Mats Andersson, Emilio Palomares, Michael Mastro, Meng Tao
PublisherMaterials Research Society
Pages187-192
Number of pages6
ISBN (Electronic)9781605117485
DOIs
StatePublished - 2016
Event2015 MRS Spring Meeting - San Francisco, United States
Duration: Apr 6 2015Apr 10 2015

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1771
ISSN (Print)0272-9172

Other

Other2015 MRS Spring Meeting
CountryUnited States
CitySan Francisco
Period4/6/154/10/15

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