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DICP Researchers Prepare a Flexible Perovskite Solar Cells Attained the World's Efficiency Record
  English.dicp.cas.cn    Posted:2016-05-25    From:DNL1606

The flexible solar cells exhibit many advantages including lightweight, more portable, rollable, which is easy to package, store, transport and install. It makes flexible solar cells may apply for camping, backpacking, remote operation, boat, motor, aircraft and so on. However, the interfacial layers in perovskite solar cells are often need pre-sintered at high temperature (> 450 °C). The high temperature treatment can not only increase energy consumption, but also exclude possibilities to use flexible substrates.

The happenstance has inspired Silicon-based Solar Cell Research Group led by Prof. LIU Shengzhong from Dalian Institute of Chemical Physics. They developed a process to fabricate a very dense TiO2 coating using DC magnetron sputtering at room temperature. The efficiency of the flexible perovskite solar cells with the low temperature TiO2 and has reached 15.07%. The related results were published online in Energy & Environmental Science.

Recently, Prof. LIU’s group found the solid-state ionic-liquid (ss-IL) can easily fabricate at low temperature. Therefore, they used the ss-IL as the electron transport materials (ETM) to fabricate the flexible perovskite solar cells, and the efficiency has reached 16.09%. To the best of our knowledge, this is the highest value to report so far.

The excellent performance of the flexible solar cells is originated from outstanding properties of the ss-IL, such as anti-reflection, high electron mobility, suitable work function and reduced trap-state density for the perovskite layer deposited whereupon. Furthermore, the ss-IL ETM can not only improve the performance of the flexible perovskite solar cells, but also effectively suppress the hysteresis notoriously in perovskite cells field. Moreover, the low-temperature processing enables low cost roll-to-roll production that may promote the ss-IL as a star ETM for the high efficiency flexible solar cells.

The device structure and J-V performance of flexible perovskite solar cells(Image by Dong Yang and Doudou Zhang)

The related results were published online in the journal of Advanced Materials. (Advanced Materials, DOI: 10.1002/adma.201600446) (Text /Image by YANG Dong and ZHANG Doudou)

Dr. LU Xinyi

Dalian Institute of Chemical Physics, Chinese Academy of Sciences,

457 Zhongshan Road, Dalian, 116023, China,

Tel: 86-411-84379201,

E-mail: luxinyi@dicp.ac.cn 

 

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