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Core/Shell Nanocrystal Tailored Carrier Dynamics in Hysteresisless Perovskite Solar Cells with ∼20% Efficiency and Long Operational Stability.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-12-30 , DOI: 10.1021/acs.jpclett.9b03774 Anima Ghosh 1 , Dhirendra K Chaudhary 1 , Arnab Mandal 1 , Sayan Prodhan 2 , Kamlesh Kumar Chauhan 2 , Saket Vihari 3 , Govind Gupta 3 , Prasanta Kumar Datta 2 , Sayan Bhattacharyya 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-12-30 , DOI: 10.1021/acs.jpclett.9b03774 Anima Ghosh 1 , Dhirendra K Chaudhary 1 , Arnab Mandal 1 , Sayan Prodhan 2 , Kamlesh Kumar Chauhan 2 , Saket Vihari 3 , Govind Gupta 3 , Prasanta Kumar Datta 2 , Sayan Bhattacharyya 1
Affiliation
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The ambient stability, hysteresis, and trap states in organo-halide perovskite solar cells (PSCs) are correlated to the influence of interlayer interfaces and grain boundaries. Astute incorporation of Cu2ZnSnS4 (CZTS) and Au/CZTS core/shell nanocrystals (NCs) can realize the goal of simultaneously achieving better performance and ambient stability of the PSCs. With optimized Au/CZTS NC size and concentration in the photoactive layer, power conversion efficiency can be increased up to 19.97 ± 0.6% with ambient air stability >800 h, as compared to 14.46 ± 1.02% for the unmodified devices. Through efficient carrier generation by CZTS and perovskite, accompanied by the plasmonic effect of Au, carrier density is sufficiently increased as validated by transient absorption spectroscopy. NCs facilitate the interfacial charge transfer by suitable band alignment and removal of recombination centers such as metallic Pb0, surface defects, or impurity sites. NC embedding also increases the perovskite grain size and assists in pinhole filling, reducing the trap state density.
中文翻译：
无磁滞钙钛矿太阳能电池中的核/壳纳米晶体定制载流子动力学，效率约为20％，具有长期的操作稳定性。
有机卤化物钙钛矿太阳能电池（PSC）中的环境稳定性，滞后性和陷阱态与层间界面和晶界的影响相关。Cu2ZnSnS4（CZTS）和Au / CZTS核/壳纳米晶体（NC）的巧妙掺入可以实现同时实现PSC更好的性能和环境稳定性的目标。通过优化Au / CZTS NC尺寸和光敏层中的浓度，在环境空气稳定性> 800 h的情况下，功率转换效率可以提高到19.97±0.6％，而未修改的器件则为14.46±1.02％。通过CZTS和钙钛矿的有效载流子产生，并伴随着Au的等离激元效应，载流子密度已得到充分提高，这已通过瞬态吸收光谱法进行了验证。NC通过合适的能带排列和去除复合中心（例如金属Pb0，表面缺陷或杂质位点）来促进界面电荷转移。NC嵌入还会增加钙钛矿的晶粒尺寸，并有助于针孔填充，从而降低陷阱态密度。
更新日期：2020-01-10
中文翻译：
无磁滞钙钛矿太阳能电池中的核/壳纳米晶体定制载流子动力学，效率约为20％，具有长期的操作稳定性。
有机卤化物钙钛矿太阳能电池（PSC）中的环境稳定性，滞后性和陷阱态与层间界面和晶界的影响相关。Cu2ZnSnS4（CZTS）和Au / CZTS核/壳纳米晶体（NC）的巧妙掺入可以实现同时实现PSC更好的性能和环境稳定性的目标。通过优化Au / CZTS NC尺寸和光敏层中的浓度，在环境空气稳定性> 800 h的情况下，功率转换效率可以提高到19.97±0.6％，而未修改的器件则为14.46±1.02％。通过CZTS和钙钛矿的有效载流子产生，并伴随着Au的等离激元效应，载流子密度已得到充分提高，这已通过瞬态吸收光谱法进行了验证。NC通过合适的能带排列和去除复合中心（例如金属Pb0，表面缺陷或杂质位点）来促进界面电荷转移。NC嵌入还会增加钙钛矿的晶粒尺寸，并有助于针孔填充，从而降低陷阱态密度。
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