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Tailoring Perovskite Adjacent Interfaces by Conjugated Polyelectrolyte for Stable and Efficient Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-02-25 , DOI: 10.1002/solr.202000060
Bowei Li 1 , Yuren Xiang 1 , K. D. G. Imalka Jayawardena 1 , Deying Luo 2 , John F. Watts 3 , Steven Hinder 3 , Hui Li 1, 4 , Victoria Ferguson 1 , Haitian Luo 4 , Rui Zhu 2 , S. Ravi P. Silva 1 , Wei Zhang 1
Affiliation  

Interface engineering is an effective means to enhance the performance of thin‐film devices, such as perovskite solar cells (PSCs). Herein, a conjugated polyelectrolyte, poly[(9,9‐bis(3′‐((N,N‐dimethyl)‐N‐ethyl‐ammonium)‐propyl)‐2,7‐fluorene)‐alt‐2,7‐(9,9‐dioctylfluorene)]di‐iodide (PFN‐I), is used at the interfaces between the hole transport layer (HTL)/perovskite and perovskite/electron transport layer simultaneously, to enhance the device power conversion efficiency (PCE) and stability. The fabricated PSCs with an inverted planar heterojunction structure show improved open‐circuit voltage (Voc), short‐circuit current density (Jsc), and fill factor, resulting in PCEs up to 20.56%. The devices maintain over 80% of their initial PCEs after 800 h of exposure to a relative humidity 35–55% at room temperature. All of these improvements are attributed to the functional PFN‐I layers as they provide favorable interface contact and defect reduction.

中文翻译:

通过共轭聚电解质为稳定高效的太阳能电池定制钙钛矿相邻界面

接口工程是增强诸如钙钛矿太阳能电池(PSC)之类的薄膜设备性能的有效手段。在这里,共轭聚电解质,聚[(9,9-双(3'-((N,N-二甲基)-N-乙基-铵)-丙基)-2,7-芴)-alt-2,7- (9,9-二辛基芴)]二碘化物(PFN-1)同时用于空穴传输层(HTL)/钙钛矿和钙钛矿/电子传输层之间的界面,以提高器件功率转换效率(PCE)和稳定性。制作的具有反向平面异质结结构的PSC显示出改善的开路电压(V oc),短路电流密度(J sc)和填充因子,导致PCE高达20.56%。在室温下暴露于相对湿度35-55%的800小时后,这些设备可维持其初始PCE的80%以上。所有这些改进都归功于功能性PFN-1层,因为它们提供了良好的界面接触并减少了缺陷。
更新日期:2020-02-25
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