Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-06 , DOI: 10.1002/advs.201700183 Giovanni Landi 1 , Heinz Christoph Neitzert 1 , Carlo Barone 2 , Costantino Mauro 2 , Felix Lang 3 , Steve Albrecht 3 , Bernd Rech 3 , Sergio Pagano 2
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-06 , DOI: 10.1002/advs.201700183 Giovanni Landi 1 , Heinz Christoph Neitzert 1 , Carlo Barone 2 , Costantino Mauro 2 , Felix Lang 3 , Steve Albrecht 3 , Bernd Rech 3 , Sergio Pagano 2
Affiliation
|
In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH3NH3PbI3‐based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, and electron–phonon scattering, is formulated evidencing how the presence of shallow and deeper band tail states influences the solar cell recombination losses. At low temperatures, the observed cascade capture process indicates that the trapping of the charge carriers by shallow defects is phonon assisted directly followed by their recombination. By increasing the temperature, a phase modification of the CH3NH3PbI3 absorber layer occurs and for temperatures above the phase transition at about 160 K the capture of the charge carrier takes place in two steps. The electron is first captured by a shallow defect and then it can be either emitted or thermalize down to a deeper band tail state and recombines subsequently. This result reveals that in perovskite solar cells the recombination kinetics is strongly influenced by the electron–phonon interactions. A clear correlation between the morphological structure of the perovskite grains, the energy disorder of the defect states, and the device performance is demonstrated.
中文翻译：
钙钛矿太阳能电池电子缺陷态分布与器件性能的相关性
在本研究中，利用在不同温度和不同光照水平下测量的随机电流波动来了解甲基碘化铅CH 3 NH 3 PbI 3基钙钛矿太阳能电池中的载流子动力学。制定了一个结合捕获/去捕获、复合机制和电子声子散射的模型，证明浅带尾态和更深带尾态的存在如何影响太阳能电池的复合损耗。在低温下，观察到的级联捕获过程表明，浅缺陷对电荷载流子的捕获是声子辅助的，随后它们的复合。通过升高温度，发生CH 3 NH 3 PbI 3吸收层的相变，并且对于高于约160K的相变的温度，电荷载流子的捕获分两步发生。电子首先被浅缺陷捕获，然后可以发射或热化到更深的带尾态，并随后重新组合。这一结果表明，在钙钛矿太阳能电池中，复合动力学受到电子-声子相互作用的强烈影响。钙钛矿晶粒的形态结构、缺陷态的能量无序和器件性能之间存在明显的相关性。
更新日期：2017-07-06
中文翻译：
钙钛矿太阳能电池电子缺陷态分布与器件性能的相关性
在本研究中，利用在不同温度和不同光照水平下测量的随机电流波动来了解甲基碘化铅CH 3 NH 3 PbI 3基钙钛矿太阳能电池中的载流子动力学。制定了一个结合捕获/去捕获、复合机制和电子声子散射的模型，证明浅带尾态和更深带尾态的存在如何影响太阳能电池的复合损耗。在低温下，观察到的级联捕获过程表明，浅缺陷对电荷载流子的捕获是声子辅助的，随后它们的复合。通过升高温度，发生CH 3 NH 3 PbI 3吸收层的相变，并且对于高于约160K的相变的温度，电荷载流子的捕获分两步发生。电子首先被浅缺陷捕获，然后可以发射或热化到更深的带尾态，并随后重新组合。这一结果表明，在钙钛矿太阳能电池中，复合动力学受到电子-声子相互作用的强烈影响。钙钛矿晶粒的形态结构、缺陷态的能量无序和器件性能之间存在明显的相关性。
京公网安备 11010802027423号