Pressure-enhanced electronic coupling of highly passivated quantum dot films to improve photovoltaic performance
Pressure-enhanced electronic coupling of highly passivated quantum dot films to improve photovoltaic performance
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高度钝化量子点薄膜的压力增强电子耦合可提高光伏性能
DOI：
10.1063/1.5110749
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发表时间：
2019-11
影响因子：
4
通讯作者：
Liu Yichun
中科院分区：
文献类型：
--
作者：
Wang Yinglin;An Meiqi;Jia Yuwen;Wang Lei;Li Jinhuan;Weng Binbin;Zhang Xintong;Liu Yichun
由于相转移配体交换（PTLE）方法的发展，PbS胶体量子点太阳能电池（cqdsc）最近取得了显着的性能增强。然而，ptle钝化CQDs缺乏紧凑的封装，损害了点间电子耦合，从而严重限制了性能的进一步提高。为了解决这个电子耦合问题，我们报道了一个简单而有效的外部压力（0-2 MPa）过程。我们发现，施加压力后，点间距离减小。光学和电学测量都清楚地表明，距离的减小可以有效地加强点间电子耦合，从而促进CQD层的载流子输运。然而，过大的压力（bbb2mpa）会加速cqdsc的有害载流子重组过程。因此，通过优化载流子输运和复合工艺，我们在1.5 MPa的中等压力下实现了8.2%的最大功率转换效率，比无外压的太阳能电池提高了25.5%。这种有效的外压策略也可以应用于其他基于cqd的光电器件，以实现更好的器件性能。由于相转移配体交换（PTLE）方法的发展，PbS胶体量子点太阳能电池（cqdsc）最近取得了显着的性能增强。然而，ptle钝化CQDs缺乏紧凑的封装，损害了点间电子耦合，从而严重限制了性能的进一步提高。为了解决这个电子耦合问题，我们报道了一个简单而有效的外部压力（0-2 MPa）过程。我们发现，施加压力后，点间距离减小。光学和电学测量都清楚地表明，距离的减小可以有效地加强点间电子耦合，从而促进CQD层的载流子输运。然而，过大的压力（bbb2mpa）会加速cqdsc的有害载流子重组过程。因此，通过优化载流子输运和重组过程，我们实现了8.2%的最大功率转换效率。
PbS colloidal quantum dot solar cells (CQDSCs) have recently achieved remarkable performance enhancement due to the development of the phase-transfer ligand exchange (PTLE) method. However, the lack of compact packing of the PTLE-passivated CQDs impairs the interdot electronic coupling and thereby severely restricts further improvement in performance. To address this electronic coupling issue, we report a simple yet effective process of external pressure (0–2 MPa). We find that the interdot distance is reduced after the application of the pressure. Both optical and electrical measurements clearly demonstrate that the distance reduction can effectively strengthen the interdot electronic coupling, thus promoting the carrier transport of the CQD layer. However, too much pressure (>2 MPa) could accelerate the detrimental carrier recombination processes of CQDSCs. Accordingly, by optimizing the carrier transport and recombination processes, we achieve the maximum power conversion efficiency of 8.2% with a moderate pressure of 1.5 MPa, which is 25.5% higher than the solar cell without the external pressure. This effective strategy of external pressure could also be applied to other CQD-based optoelectronic devices to realize a better device performance.PbS colloidal quantum dot solar cells (CQDSCs) have recently achieved remarkable performance enhancement due to the development of the phase-transfer ligand exchange (PTLE) method. However, the lack of compact packing of the PTLE-passivated CQDs impairs the interdot electronic coupling and thereby severely restricts further improvement in performance. To address this electronic coupling issue, we report a simple yet effective process of external pressure (0–2 MPa). We find that the interdot distance is reduced after the application of the pressure. Both optical and electrical measurements clearly demonstrate that the distance reduction can effectively strengthen the interdot electronic coupling, thus promoting the carrier transport of the CQD layer. However, too much pressure (>2 MPa) could accelerate the detrimental carrier recombination processes of CQDSCs. Accordingly, by optimizing the carrier transport and recombination processes, we achieve the maximum power conversion efficiency of 8.2% with a mode...
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影响因子：
41.2
作者：
Chuang, Chia-Hao M.;Brown, Patrick R.;Bulovic, Vladimir;Bawendi, Moungi G.
通讯作者：
Bawendi, Moungi G.
影响因子：
10.8
作者：
Baumgardner, William J.;Whitham, Kevin;Hanrath, Tobias
通讯作者：
Hanrath, Tobias
影响因子：
6.7
作者：
J. Jang;H. Shim;Yeonkyeong Ju;Jung-Hoon Song;H. An;Jong-Su Yu;Sun-Woo Kwak;Taik-Min Lee;Inyoung Kim;Sohee Jeong
通讯作者：
J. Jang;H. Shim;Yeonkyeong Ju;Jung-Hoon Song;H. An;Jong-Su Yu;Sun-Woo Kwak;Taik-Min Lee;Inyoung Kim;Sohee Jeong
影响因子：
29.4
作者：
Tang, Jiang;Sargent, Edward H.
通讯作者：
Sargent, Edward H.
影响因子：
16.6
作者：
D. Zhitomirsky;O. Voznyy;L. Levina;S. Hoogland;Kyle W. Kemp;Alexander H. Ip;S. Thon;E. Sargent
通讯作者：
D. Zhitomirsky;O. Voznyy;L. Levina;S. Hoogland;Kyle W. Kemp;Alexander H. Ip;S. Thon;E. Sargent