Tailoring Perovskite Adjacent Interfaces by Conjugated Polyelectrolyte for Stable and Efficient Solar Cells
Tailoring Perovskite Adjacent Interfaces by Conjugated Polyelectrolyte for Stable and Efficient Solar Cells
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DOI：
10.1002/solr.202000060
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发表时间：
2020-02
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影响因子：
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通讯作者：
Bowei Li;Yuren Xiang;K. Jayawardena;Deying Luo;J. Watts;S. Hinder;Hui Li;V. Ferguson;Haitian Lu
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文献类型：
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作者：
Bowei Li;Yuren Xiang;K. Jayawardena;Deying Luo;J. Watts;S. Hinder;Hui Li;V. Ferguson;Haitian Lu
界面工程是提高薄膜器件（如钙钛矿太阳能电池（PSC））性能的有效手段。本文中，在空穴传输层（HTL）/钙钛矿和钙钛矿/电子传输层之间的界面处同时使用共辄的聚[（9，9-双（3′-（（N，N-二甲基）-N-乙基-铵）-丙基）-2，7-芴）-交替-2，7-（9，9-二辛基芴）]二碘化物（PFN-I），以提高器件的功率转换效率（PCE）和稳定性。所制造的具有倒置平面异质结结构的PSC显示出改善的开路电压（Voc）、短路电流密度（Jsc）和填充因子，导致PCE高达20.56%。在室温下暴露于35-55%相对湿度800 h后，器械保持其初始PCE的80%以上。所有这些改进都归功于功能性PFN-I层，因为它们提供了有利的界面接触和缺陷减少。
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.