Strong Photocurrent from Two-Dimensional Excitons in Solution-Processed Stacked Perovskite Semiconductor Sheets.
Strong Photocurrent from Two-Dimensional Excitons in Solution-Processed Stacked Perovskite Semiconductor Sheets.
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DOI：
10.1021/acsami.5b07026
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发表时间：
2015-11-18
影响因子：
9.5
通讯作者：
Baumberg JJ
中科院分区：
文献类型：
--
作者：
Ahmad S;Kanaujia PK;Beeson HJ;Abate A;Deschler F;Credgington D;Steiner U;Prakash GV;Baumberg JJ
二维无机-有机钙钛矿结构器件的室温光电流测量表明，尽管激子的结合能比热能大10倍以上，但激子对光电流的贡献很大。P型(C6H9C2H4NH3)2PbI4在金属肖特基铝接触处释放光载流子，但结合电子和空穴传输层可将提取的光电流提高100倍。当二氧化钛纳米粒子直接集成到钙钛矿层中时，虽然二维激子半导体层没有明显破坏，但进一步获得了10倍的增益。这些结果表明，尽管激子结合能很高，但强激子材料仍可用作光伏材料，并为更好地理解相关三维钙钛矿的光伏性质提供了机制。
Room-temperature photocurrent measurements in two-dimensional (2D) inorganic–organic perovskite devices reveal that excitons strongly contribute to the photocurrents despite possessing binding energies over 10 times larger than the thermal energies. The p-type (C6H9C2H4NH3)2PbI4 liberates photocarriers at metallic Schottky aluminum contacts, but incorporating electron- and hole-transport layers enhances the extracted photocurrents by 100-fold. A further 10-fold gain is found when TiO2 nanoparticles are directly integrated into the perovskite layers, although the 2D exciton semiconducting layers are not significantly disrupted. These results show that strong excitonic materials may be useful as photovoltaic materials despite high exciton binding energies and suggest mechanisms to better understand the photovoltaic properties of the related three-dimensional perovskites.