Strong addition effect of charge-bridging polymer in polymer:fullerene solar cells with low fullerene content

Abstract

The efficiency of polymer:fullerene solar cells with low fullerene content is significantly improved by adding a charge-bridging polymer.

Versatile third components for efficient and stable organic solar cells

“…103 Some other light-absorbing polymers were used as the third component to enhance the performance of OSCs. [107][108][109][110][111][112][113][114][115][116][117][118] For instance, OSCs based on P3HT/THC8/PC 61 BM exhibited a better PCE (3.88%) compared with that of the binary blend (3.10%). 107 The addition of 5% PTB7 enhanced the PCE from 2.93% to 4.07% in PCPDTBT/PC 71 BM-based OSCs.…”

Efficient and thermally stable BHJ solar cells based on a soluble hydroxy-functionalized regioregular polydodecylthiophene

“…The photoluminescence (PL) spectra of the polymer/PCBM blends were recorded to evaluate the most appropriate ED/EA ratio for preparing efficient BHJ cells. For example, the P3HT/PCBM mass ratio should be higher than 1:0.75 in order to achieve an appreciable power conversion efficiency (PCE>2.5%) [43], even though there is no clear indication in literature for the upper limit for PCBM content. In view ofthis, we recorded the PL spectra of both PT12Br-based (Fig.…”

Light-Induced Open Circuit Voltage Increase in Polymer Solar Cells with Ternary Bulk Heterojunction Nanolayers

“…was used in consideration of its energy band structure because its addition resulted in a significant PCE enhancement in the case of the P3HT:PC 61 BM solar cells with a low fullerene content (P3HT:PC 61 BM = 1:0.5 by weight) in our recent report. 28 In the present study, unlike the previous work, the weight ratio of polymers (P3HT + PBDTTPD) to PC 61 BM was fixed as 1:1 by weight because this composition has been confirmed to deliver one of the best PCEs for the P3HT:PC 61 BM solar cells. The resulting ternary solar cells were examined by measuring the device performances under continuous (10 h) illumination of solar light (100 mW/cm 2 ).…”

“…In this work, as an alternative approach for the stability improvement in the polymer:fullerene solar cells, we attempted to introduce a third polymer to the P3HT:PC 61 BM blends in order to investigate the role of the third component (polymer) on the stability of solar cells. As the third component, poly­[(4,8-bis­(2-ethylhexyloxy)-benzo­[1,2-b:4,5-b′]­dithiophene)-2,6-diyl- alt -(N-2-ethylhexylthieno­[3,4- c ]­pyrrole-4,6-dione)-2,6-diyl]] (PBDTTPD) was used in consideration of its energy band structure because its addition resulted in a significant PCE enhancement in the case of the P3HT:PC 61 BM solar cells with a low fullerene content (P3HT:PC 61 BM = 1:0.5 by weight) in our recent report . In the present study, unlike the previous work, the weight ratio of polymers (P3HT + PBDTTPD) to PC 61 BM was fixed as 1:1 by weight because this composition has been confirmed to deliver one of the best PCEs for the P3HT:PC 61 BM solar cells.…”