Modelling of quantum dot intermediate band solar cells: effect of intermediate band linewidth broadening
Modelling of quantum dot intermediate band solar cells: effect of intermediate band linewidth broadening
复制标题
量子点中带太阳能电池的建模：中带线宽展宽的影响
DOI：
10.1049/iet-opt.2013.0068
复制
发表时间：
2014
影响因子：
1.6
通讯作者：
Wang Q
中科院分区：
文献类型：
--
作者：
Wang Q
详细的平衡方法被用来模拟量子点中间带太阳能电池（QD-IBSC）。假设没有载流子损失的相同QD的模型对于1.95 eV的带隙具有63.24%的峰值效率，其中中间带（IB）位于价带上方1.24 eV或导带下方。通过引入IB的非均匀加宽来引入QD中的非均匀性的影响，并且还引入了描述寿命加宽效应的均匀加宽。首先考虑基态的高斯非均匀加宽，然后考虑其他非均匀加宽，包括基态加激发态分布。非均匀加宽从理想IB能量位置移除状态密度，从而降低效率。然而，QD-IB能级的均匀加宽允许更多的非共振QD态能够有助于最佳IB光子的吸收。这种加宽还允许接近最佳IB光子能量的光子也被吸收。这两种效果都导致效率的提高。这些非均匀和均匀加宽之间的相互作用允许QD的实际非均匀阵列中的效率保持接近理想值。
A detailed balanced approach is used to model a quantum‐dot intermediate band solar cell (QD‐IBSC). A model assuming identical QDs with no carrier losses has peak efficiency of 63.24% for a bandgap of 1.95 eV with the intermediate band (IB) positioned either 1.24 eV above the valence band or below the conduction band. The effect of inhomogeneities in the QDs is introduced by incorporating an inhomogeneous broadening of the IB, and the homogeneous broadening describing life‐time broadening effects is also introduced. A Gaussian inhomogeneous broadening of the ground state is considered initially and then other inhomogeneous broadenings are considered, including a ground plus excited state distribution. The inhomogeneous broadening removes state density from the ideal IB energy position and thereby reduces efficiency. However, the homogeneous broadening of the QD‐IB levels allows more off‐resonance QD states to be able to contribute to absorption of the optimum IB photon. This broadening also allows photons near the optimum IB photon energy to be absorbed as well. Both these effects lead to an increase in efficiency. The inter‐play between these inhomogeneous and homogeneous broadening allows the efficiency in realistic inhomogeneous arrays of QDs to remain close to the ideal values.
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润湿层态对量子点激光器增益电流特性影响的实验研究
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
D. Matthews;H. Summers;P. Smowton;M. Hopkinson
通讯作者：
M. Hopkinson
影响因子：
3.1
作者：
Luque, A;Martí, A;Cuadra, L
通讯作者：
Cuadra, L
影响因子：
2.4
作者：
Sugawara, M;Akiyama, T;Ishikawa, H
通讯作者：
Ishikawa, H
DOI：
10.1109/jstqe.2002.804250
发表时间：
2002-09-01
影响因子：
4.9
作者：
Borri, P;Langbein, W;Bimberg, D
通讯作者：
Bimberg, D