Understanding Hole Extraction of Inverted Perovskite Solar Cells
Understanding Hole Extraction of Inverted Perovskite Solar Cells
复制标题
了解倒置钙钛矿太阳能电池的孔提取
DOI：
10.1021/acsami.0c18108
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Thomas P. Russell
中科院分区：
文献类型：
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作者：
Zhewei Zhang;Madhu Sheri;Zachariah A. Page;Todd Emrick;Akinori Saeki;Yao Liu;Thomas P. Russell
本文描述了聚合物空穴传输层和钙钛矿活性层界面的电荷提取和能级排列之间的关系。通过调整空穴传输材料共轭主链的组成，钙钛矿和空穴传输层之间的能级是不同的。匹配钙钛矿/空穴传输界面的能带排列极大地改善了电荷提取，从而提高了器件性能。为了阐明空穴传输动力学，时间分辨微波电导测量表明，空穴传输层的能级对该界面的空穴提取效率有很大影响，这一发现与器件性能指标很好地吻合。此外，光致发光、莫特-肖特基和空间电荷限制电流测量支持空穴传输层和钙钛矿型有源层之间的能级对齐能够在器件界面上更有效地提取和传输空穴。围绕倒置钙钛矿器件中的空穴提取的洞察将有助于设计有效的空穴传输材料，这反过来又有助于生产更高效的太阳能电池。
This paper describes a correlation between charge extraction and energy-level alignment at the interface of polymeric hole transport layers and perovskite active layers. By tailoring the composition of the conjugated backbone of the hole transport material, energy levels between perovskites and hole transport layers are varied. Matching the band alignment at perovskite/hole transport interfaces dramatically improved charge extraction and thus device performance. Time-resolved microwave conductivity measurements, performed to elucidate hole transfer kinetics, suggest that hole transport layer energy levels greatly influence hole extraction efficiency at this interface, a finding that agrees well with device performance metrics. Furthermore, photoluminescence, Mott–Schottky, and space charge limited current measurements support that energy-level alignment between the hole transport layer and perovskite active layer enables more efficient hole extraction and transport at the device interface. The insight surrounding hole extraction in inverted perovskite devices will help design effective hole transport materials, which, in turn, facilitates the production of more efficient solar cells.