Control of Charge Dynamics via Use of Nonionic Phosphonate Chains and Their Effectiveness for Inverted Structure Solar Cells
Control of Charge Dynamics via Use of Nonionic Phosphonate Chains and Their Effectiveness for Inverted Structure Solar Cells
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DOI：
10.1002/aenm.201500844
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发表时间：
2015-09
影响因子：
27.8
通讯作者：
Gyoungsik Kim;Seyeong Song;Jungho Lee;Taehyo Kim;Tack Ho Lee;Bright Walker;Jin Young Kim;Changduk Yan
中科院分区：
文献类型：
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作者：
Gyoungsik Kim;Seyeong Song;Jungho Lee;Taehyo Kim;Tack Ho Lee;Bright Walker;Jin Young Kim;Changduk Yan
考虑到可以使用极性和亲水性官能团在混合有机/无机界面处实现高相容性，该方法用于通过将非离子膦酸酯侧链（以0%、5%、15%和30%取代水平）引入一系列基于异靛蓝的聚合物（PIIGDT-Pn）中来改善倒置聚合物太阳能电池性能。与未改性的对照聚合物相比，这种方法通过增加的短路电流（JSC）导致功率转换效率提高了约20%。这种增强被认为是源于当膦酸酯取代的水平被优化时减少的非锗酸酯重组和改进的电荷携带提取。这些结果通过详细的电气测量组合得到证实，包括空间电荷有限电流建模，光强度相关光电流（J ph）分析和形态学研究（掠入射广角X射线散射和原子力显微镜）。这是第一个实际的报告，证明使用非离子极性侧链，以控制现有的光伏聚合物结构中的载流子动力学。可以预见，这种简单的策略可以应用于其他材料系统，并产生具有更高性能潜力的新材料。
Considering that a high compatibility at hybrid organic/inorganic interfaces can be achieved using polar and hydrophilic functionalities, this approach is used to improve inverted polymer solar cell performance by introducing nonionic phosphonate side chains (at 0%, 5%, 15%, and 30% substitution levels) into a series of isoindigo‐based polymers (PIIGDT‐Pn). This approach led to ≈20% improvement in power conversion efficiency compared to a nonmodified control polymer, via an increased short‐circuit current (J SC). This enhancement is believed to stem from reduced nongerminate recombination and improved charge carried extraction when the level of phosphonate substitution is optimized. These results are substantiated by a combination of detailed electrical measurements including space‐charged limited current modeling, light intensity–dependent photocurrent (J ph) analysis, and morphological studies (grazing‐incidence wide‐angle X‐ray scattering and atomic force microscopy). This is the first practical report demonstrating the use of nonionic polar side chains to control charge carrier dynamics in an existing photovoltaic polymer structure. It is envisioned that this simple strategy may be applied to other material systems and yield new materials with the potential for even higher performance.