报告题目：perovskite solar cells
报告人：prof. qiquan qiao (乔启全)
单位：department of
electrical engineering and computer science south, dakota state
university, usa
报告时间：2017年6月23日（星期五）下午15:00-17:00
报告地点：联合楼a201
biography – qiquan
(quinn) qiao：
dr. qiquan qiao is a harold c hohback professor and
graduate coordinator in electrical engineering at south dakota state university
(sdsu). his
current research
focuses on polymer photovoltaics, dye-sensitized solar cells, perovskite solar cells and
lithium ion batteries. he has published more than 120 peer-reviewed papers in leading
journals including energy and environmental science, journal of the american
chemical society, advanced materials, advanced functional materials, advanced
energy materials, nanoscale, and nano energy, etc. he has received 2014 f o
butler award for excellence in research at sdsu, 2010 us nsf career, and 2009
bergmann memorial award from the us-israel bi-national science foundation.
abstract
perovskite solar cells are highly efficient solution-processable devices because of their broad band light
absorbing property and long charge diffusion pathway. for the first time, room temperature
heating free growth and crystallization of perovskite films in ambient air
without use of thermal annealing was reported. highly efficient perovskite nanorod-based solar cells
were made using ito/pedot:pss/ch3nh3pbi3 nanorods/pc60bm/rhodamine/ag. all the layers except pedot:pss were processed
at room temperature thereby eliminating the need for thermal treatment.
perovskite films were spin coated inside a n2 filled glove box and
immediately were taken outside in air having 40% relative humidity (rh).
exposure to humid air was observed to promote the crystallization process in
perovskite films even at room temperature. perovskite films kept for 5 hours in
ambient air showed nanorod-like morphology having high crystallinity. such devices
exhibited the highest pce of 16.83%, which is much higher than the pce of
11.94% for traditional thermal-annealed perovskite film based devices. it was
concluded that moisture plays an important role in room temperature
crystallization of pure perovskite nanorods, showing improved optical and charge
transport properties, which resulted in high performance solar cells.