Rapid Charge-Transfer Cascade through SWCNT Composites Enabling Low-Voltage Losses for Perovskite Solar Cells
Rapid Charge-Transfer Cascade through SWCNT Composites Enabling Low-Voltage Losses for Perovskite Solar Cells
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DOI：
10.1021/acsenergylett.9b01041
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发表时间：
2019-08-01
影响因子：
22
通讯作者：
Blackburn, Jeffrey L.
中科院分区：
文献类型：
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作者：
Habisreutinger, Severin N.;Noel, Nakita K.;Blackburn, Jeffrey L.
良好的电荷选择性接触是实现高效钙钛矿型太阳能电池的关键。这种接触的选择性取决于它与钙钛矿吸收体带的能量偏移或对齐，最重要的是它的界面复合损失。在这项研究中，我们使用单壁碳纳米管(SWCNTs)作为高迁移率的空穴萃取层，位于与钙钛矿型吸收体的界面处。当被用作具有低迁移率空穴选择接触的电荷转移级联结构时，这种结构可以通过快速去除界面区域中的空穴来抑制界面复合。降低这些复合损耗进而导致n-i-p钙钛矿太阳能电池的电压损耗非常低，低于340 mV。
Good charge selective contacts are vital to achieving efficient perovskite solar cells. The selectivity of such a contact is determined by its energetic offset or alignment with the bands of the perovskite absorber and, most importantly, by its interfacial recombination losses. In this study, we use single-walled carbon nanotubes (SWCNTs) as a high-mobility hole extraction layer at the interface with a perovskite absorber. When employed as a charge-transfer cascade-like structure with a low-mobility hole-selective contact, this configuration can suppress the interfacial recombination through the rapid removal of holes from the interface region. Reducing these recombination losses in turn results in very low voltage losses of less than 340 mV in n-i-p perovskite solar cells.