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首页> 外文期刊>RSC Advances >Hetero aromatic donors as effective terminal groups for DPP based organic solar cells
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Hetero aromatic donors as effective terminal groups for DPP based organic solar cells

机译：杂芳族供体作为基于DPP的有机太阳能电池的有效末端基团

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摘要

Four new solution-processable donor–acceptor–donor (D–A–D) structured low bandgap small molecules ( CSDPP5 , CSDPP6 , CSDPP7 and CSDPP8 ) with diketopyrrolopyrrole as central acceptor unit and phenoxazine (POZ) or carbazole (CBZ) as terminal units were designed, synthesized and characterized. The new small molecules have been employed as donors along with the PC _(71) BM as electron acceptor in solution processed BHJ organic solar cells, showed broad absorption bands with suitable electrochemical energy levels. When the BHJ active layer was cast from THF solvent, the optimal power conversion efficiencies obtained with CSDPP5 , CSDPP6 , CSDPP7 and CSDPP8 are 2.97% 3.06%, 2.42% and 2.43% respectively. The PCE of the devices when processed with DIO/THF solvent, have been further enhanced to 4.69%, 4.14% for CSDPP6 :PC _(71) BM and CSDPP8 :PC _(71) BM active layers respectively. The enhancement in PCE has been attributed to change in nanoscale morphology and more balanced charge transport resulting from increased hole mobility.
机译：四种新的溶液可加工的供体 - 受体（D-A-D）用二酮吡咯醇作为中央受体单元和苯氧嘧啶（POZ）或咔唑（CBZ）作为终端单元设计，合成和表征。新的小分子作为供体以及PC _（71）BM作为溶液加工的BHJ有机太阳能电池的电子受体，显示出具有合适的电化学能量水平的宽吸收带。当BHJ活性层从THF溶剂中施放时，用CSDPP5，CSDPP6，CSDPP7和CSDPP8获得的最佳功率转换效率分别为2.97％3.06％，2.42％和2.43％。用DIO / THF溶剂加工时，装置的PCE进一步增强至CSDPP6：PC _（71）BM和CSDPP8：PC _（71）BM活动层的4.69％，4.14％。 PCE的增强归因于纳米级形态的变化和由增加的空穴移动性导致的更平衡的电荷输送。

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