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Quantitatively Characterized Crystallization Effect on Recombination Energy Loss in Non-Fullerene Organic Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-05-13 , DOI: 10.1021/acs.jpcc.9b03572 Zhi-Hao Chen 1 , Peng-Qing Bi 1 , Xiao-Yu Yang 1 , Meng-Si Niu 1 , Kang-Ning Zhang 1 , Lin Feng 1 , Xiao-Tao Hao 1, 2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-05-13 , DOI: 10.1021/acs.jpcc.9b03572 Zhi-Hao Chen 1 , Peng-Qing Bi 1 , Xiao-Yu Yang 1 , Meng-Si Niu 1 , Kang-Ning Zhang 1 , Lin Feng 1 , Xiao-Tao Hao 1, 2
Affiliation
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Recombination energy loss is the main impediment on improving the power conversion efficiency of organic solar cells (OSCs). The pernicious effect is usually induced by two dynamics, that is, the geminate recombination of nascent charge pairs soon after the exciton dissociation and nongeminate recombination of separated charges during their transportation. Both hinder achieving high open-circuit voltage (VOC). Here, we comprehensively investigated the relationship between crystallization and molecular recombination in a non-fullerene system of poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene)-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl)-benzo[1,2-c:4,5-c′]dithiophene-4,8-dione))] (PBDB-T):((5Z,50Z)-5,50-(((4,4,9,9-tetraoctyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b0]dithiophene-2,7-diyl)bis(benzo[c][1,2,5]thiadia-zole-7,4-diyl))bis(methanylylidene))bis(3-ethyl-2-thioxothiazolidin-4-one)) (O-IDTBR). Based on a quantitative characterization of crystallinity, it was found that the crystallization intensity ratio between components is the key factor to suppress recombination energy losses. The nongeminate recombination showed increased probability with enlarged variance of crystallinity between the donor and acceptor. The geminate recombination was proven to be restricted by the energetic disorder of the highest occupied molecular orbital and lowest unoccupied molecular orbital, as well as the phase separation induced by crystallization. The rational crystallization intensity ratio between donor/acceptor (D/A) components is vital in achieving minimum energy loss as well as best device performance. The results are favorable for comprehending the effects of crystallinity in charge transfer and charge transport dynamics and provide guidance for morphology and crystallinity optimization in non-fullerene OSCs.
中文翻译：
定量表征非富勒烯有机太阳能电池中重组能量损失的结晶效应
重组能量损失是提高有机太阳能电池（OSC）的功率转换效率的主要障碍。有害作用通常是由两种动力学引起的，即，激子离解后不久，新生电荷对的新生重组和分离电荷在传输过程中的非新生复合。两者都阻碍实现高的开路电压（V OC）。在这里，我们全面研究了聚[（2,6-（4,8-双（5-（2-乙基己基）噻吩-2-基）苯并[1， 2- b：4,5- b ']二噻吩）-co-（1,3-二（5-噻吩-2-基）-5,7-双（2-乙基己基）-苯并[1,2- c：4,5-c '] dithiophene-4,8-dione））]]（PBDB-T）：（（（5 Z，50 Z）-5,50-（（（（4,4,9,9-四辛基-4,9-二氢-小号-indaceno [1,2 b：5,6- b 0]二噻吩-2,7-二基）双（苯并[ C ^] [1,2,5]噻二唑-7,4-二基）双（亚甲叉基）双（3-乙基-2-硫代噻唑并恶唑烷-4-一））（O-IDTBR）。基于结晶度的定量表征，发现组分之间的结晶强度比是抑制重组能损失的关键因素。非gegeminate重组显示增加的概率与供体和受体之间的结晶度差异扩大。事实证明，发芽重组受到最高占据分子轨道和最低未占据分子轨道的高能紊乱以及结晶诱导的相分离的限制。施主/受主（D / A）组件之间合理的结晶强度比对于实现最小的能量损失以及最佳的器件性能至关重要。
更新日期：2019-05-16
中文翻译：
定量表征非富勒烯有机太阳能电池中重组能量损失的结晶效应
重组能量损失是提高有机太阳能电池（OSC）的功率转换效率的主要障碍。有害作用通常是由两种动力学引起的，即，激子离解后不久，新生电荷对的新生重组和分离电荷在传输过程中的非新生复合。两者都阻碍实现高的开路电压（V OC）。在这里，我们全面研究了聚[（2,6-（4,8-双（5-（2-乙基己基）噻吩-2-基）苯并[1， 2- b：4,5- b ']二噻吩）-co-（1,3-二（5-噻吩-2-基）-5,7-双（2-乙基己基）-苯并[1,2- c：4,5-c '] dithiophene-4,8-dione））]]（PBDB-T）：（（（5 Z，50 Z）-5,50-（（（（4,4,9,9-四辛基-4,9-二氢-小号-indaceno [1,2 b：5,6- b 0]二噻吩-2,7-二基）双（苯并[ C ^] [1,2,5]噻二唑-7,4-二基）双（亚甲叉基）双（3-乙基-2-硫代噻唑并恶唑烷-4-一））（O-IDTBR）。基于结晶度的定量表征，发现组分之间的结晶强度比是抑制重组能损失的关键因素。非gegeminate重组显示增加的概率与供体和受体之间的结晶度差异扩大。事实证明，发芽重组受到最高占据分子轨道和最低未占据分子轨道的高能紊乱以及结晶诱导的相分离的限制。施主/受主（D / A）组件之间合理的结晶强度比对于实现最小的能量损失以及最佳的器件性能至关重要。
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