Understanding the sources of energy loss in bulk heterojunction (BHJ) solar cells is outstanding importance for increasing power conversion energy. Herein, we employ a full quantum mechanics approach to determine rates charge transfer processes at acceptor–donor interface prototypical BHJ blend. It shown that recombination singlet (CT) state acceptor/donor (A/D) very fast, being most effective ...

Donor-acceptor-acceptor (D-A-A) type of 1,8–naphthalimides as Non-fullerene Small Molecule Acceptors for Bulk Heterojunction Solar Cells Prabhat Gautama, Rahul Sharmaa, Rajneesh Misraa* M. L. Keshtovb, S. A. Kuklinb and Ganesh D. Sharmac* aDepartment of Chemistry, Indian Institute of Technology Indore, Indore 45, India. bInstitute of Organoelement Compounds of the Russian Academy of Sciences, V...

The nitration of 4,7-dibromo-2,1,3-benzothiadiazole was modified by using CF(3)SO(3)H and HNO(3) as the nitrating agent, and the related yield was improved greatly. On the basis of this improvement, two new small band gap polymers, P1TPQ and P3TPQ, were developed. Bulk heterojunction solar cells based on P3TPQ and [6,6]-phenyl-C(71)-butyric acid methyl ester exhibit interesting results with a p...

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A tandem solar cell device whose sub-cells are fabricated exclusively from small molecules (SMs) through both solution-processed and vacuum-processed deposition techniques is described. The front sub-cell's active layer consists of a bulk heterojunction (BHJ) DPP(TBFu)2:PC70BM device while the back cell has a typical bilayer structure employing a 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphe...

The photovoltaic conversion efficiency for near-infrared (NIR) sunlight is improved successfully by dye sensitization of bulk heterojunction polymer solar cells, in which the active layer was prepared by a ternary blend of poly(3-hexylthiophene), a fullerene derivative (1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene), and an NIR dye, silicon phthalocyanine bis(trihexylsilyl oxide)....

The current state of thin film heterojunction solar cells based on cuprous oxide (Cu₂O), cupric oxide (CuO) and copper (III) oxide (Cu₄O₃) is reviewed. These p-type semiconducting oxides prepared by Cu oxidation, sputtering or electrochemical deposition are non-toxic, sustainable photovoltaic materials with application potential for solar electricity. However, defects at the copper oxide hetero...

Vertical phase separation of the donor and the acceptor in organic bulk heterojunction solar cells is crucial to improve the exciton dissociation and charge transport efficiencies. This is because whilst the exciton diffusion length is limited, the organic film must be thick enough to absorb sufficient light. However, it is still a challenge to control the phase separation of a binary blend in ...