Chlorophyll-based organic solar cells with improved power conversion efficiency  

作　　者：Shenghan Wang Shengnan Duan Yuwei Wang Chenglin Sun Xiao-Feng Wang Shin-ichi Sasaki 

机构地区：[1]Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education),College of Physics,Jilin University,Changchun 130012,Jilin,China [2]Nagahama Institute of Bio-Science and Technology,Nagahama,Shiga 526-0829,Japan

出　　处：《Journal of Energy Chemistry》2019年第11期88-93,共6页能源化学（英文版）

基　　金：partially supported by the Natural Science Foundation of China (No. 11574111 to X-F.W.);JSPS KAKENHI Grant Number JP16K05826 in Scientific Research (C) (to S.S.);supported by the Natural Science Foundation of Jilin Province (No. 20160101303JC , 20180101238JC , 20170204076GX , 20180101006JC to C.S.);Post-Doctoral Innovative Talent Support Program (BX20180127 to S.W.)

摘　　要：Chlorophylls(Chls), and associated chlorophyll derivatives, are one of the oldest, most versatile organic semiconductors found in nature. Herein, we present two easily semi-synthesized chlorophyll derivatives, namely, chlorin e6 trimethyl ester(Ce6Me3) and its copper complex(Cu–Ce6 Me3), as the p-type dopants for organic semiconductors and their impact in organic solar cells(OSCs). In our study, both Chls showed intense Soret and Q y bands in the UV-visible spectra, leading to an effect means for capturing solar light and energy. Chls also exhibited high carrier mobility owing to the partial formation of aggregates through the spin-coating process. Using Chls, we fabricated OSCs in both planar-heterojunction(PHJ) and bulkheterojunction(BHJ) solar cell configurations, together with C70/PC70 BM as electron acceptors. In PHJ solar cells, we received solar power conversion efficiencies(PCEs) of only 0.85% and 0.93% for Cu–Ce6 Me 3-and Ce6Me3-based devices, respectively, with the thickness of the donor layer at 5 nm. In BHJ cells, we achieved much higher PCEs of 1.53% and 2.05% for Cu–Ce6Me3 :PC 70 BM and Ce6Me3 :PC 70 BM respectively, where both blending ratios were set to 1:8. The improvement on PCE in BHJ cells may be attributed to the better charge separation increase at the donor–acceptor interface.Chlorophylls（Chls）, and associated chlorophyll derivatives, are one of the oldest, most versatile organic semiconductors found in nature. Herein, we present two easily semi-synthesized chlorophyll derivatives, namely, chlorin e6 trimethyl ester（Ce6Me3） and its copper complex（Cu–Ce6 Me3）, as the p-type dopants for organic semiconductors and their impact in organic solar cells（OSCs）. In our study, both Chls showed intense Soret and Q y bands in the UV-visible spectra, leading to an effect means for capturing solar light and energy. Chls also exhibited high carrier mobility owing to the partial formation of aggregates through the spin-coating process. Using Chls, we fabricated OSCs in both planar-heterojunction（PHJ） and bulkheterojunction（BHJ） solar cell configurations, together with C70/PC70 BM as electron acceptors. In PHJ solar cells, we received solar power conversion efficiencies（PCEs） of only 0.85% and 0.93% for Cu–Ce6 Me 3-and Ce6Me3-based devices, respectively, with the thickness of the donor layer at 5 nm. In BHJ cells, we achieved much higher PCEs of 1.53% and 2.05% for Cu–Ce6Me3 :PC 70 BM and Ce6Me3 :PC 70 BM respectively, where both blending ratios were set to 1:8. The improvement on PCE in BHJ cells may be attributed to the better charge separation increase at the donor–acceptor interface.

关 键 词：ORGANIC solar cells CHLOROPHYLL DERIVATIVES FULLERENE Planar-heterojunction BULK-HETEROJUNCTION 

分 类 号：O62[理学—有机化学]