New DPP and Selenophene based NIR Absorbing Polymers for Organic Solar Cell Applications

The broad spectrum of sunlight which spans from 300 nm to 1200 nm cannot be effectively utilized in organic solar cells since most organic polymers have absorption between 300 ve 800 nm range. Recently coppolymers from diketopyrrolopyrrole (DPP) and simple donors such as thiophene and furan was shown to achieve absorption maxima around 800 nm. Here we shown that DPP coupled with selenophene pushes the absorption even futher and a polymer with absorption maxima at 830 nm (absorption onset 930 nm) could be attained. This polymer, under optimized conditions, shown a maximum conversion efficiency of 6.16% with inverted device structure using PC71BM as the electron acceptor. A significant additive effect was also observed where the device efficiencies were improved over 13-fold. EQE studies showed that there is strong contribution in the NIR region with 40% EQE achieved in the range of 700 nm to 850 nm (Figure 1). This material is also one of the rare examples of a high performance NIR absorbing polymer that does not contain any thiophene-based unit in its backbone. Synthetic efforts towards other related derivatives are currently being investigated.
International Conference on Photovoltaic Science and Technologies, (4 - 06 July 2018)


Yaşa, Mustafa; Toppare, Levent Kamil; Arslan Udum, Yasemin; Department of Polymer Science and Technology (2022-1-27)
There are several studies on organic solar cells based on conjugated polymers in literature, and various new materials are being designed. The Donor-Acceptor approach has been the most common approach for designing and synthesizing conjugated polymers. In this study, thienopyrroledione bearing conjugated polymers were synthesized via Stille and Suzuki polycondensation reactions. In the first part of this thesis, the polymers obtained via Stille polycondensation were employed to fabricate organic solar cells...
Development of helical tubular reactor for hydrogen producing photosynthetic bacteria
Sarı, Süleyman; Eroğlu, İnci; Department of Biotechnology (2007)
Photobiological hydrogen production from organic materials occurs with the help of illumination and under aerobic conditions within photobioreactors. Novel designs are needed in order to increase the light conversion efficiency and to improve the biological hydrogen production. In this thesis, purple non sulfur bacteria Rhodobacter sphaeroides O.U. 001 was employed as the hydrogen producing microorganism. Two different types of photobioreactors, namely oscillatory helical photobioreactor and recycling helic...
A triazoloquinoxaline and benzodithiophene bearing low band gap copolymer for electrochromic and organic photovoltaic applications
HACIOGLU, Serife O.; UNLU, Naime A.; AKTAS, Ece; HIZALAN, Gonul; Yildiz, Esra D.; Çırpan, Ali; Toppare, Levent Kamil (2017-06-01)
A new triazoloquinoxaline and benzodithiophene based copolymer was synthesized to investigate its electro-chemical, optical and photovoltaic behaviors. According to the polymer design, combination of two acceptor units (benzotriazole and quinoxaline) which contribute imine bonds to the structure and a triazoloquinoxaline unit for enhancing electron accepting ability was pursued. As a result of electrochemical studies, the copolymer PTQBDT has a low lying HOMO energy level as - 5.23 eV which increases the ch...
Dual-band high-frequency metamaterial absorber based on patch resonator for solar cell applications and its enhancement with graphene layers
Ustunsoy, Mehmet Pasa; Sabah, Cumali (2016-12-05)
In this paper, a dual-band high-frequency metamaterial absorber based on patch resonator is designed and analyzed for solar cells. In order to obtain a metamaterial absorber, metal-semiconductor-metal layers are combined. The results of the designed structure are shown in the infrared and visible ranges of solar spectrum. Structural parameters and dimensions of the device have a significant importance on the performance of the designed absorber. The simulations are carried out with full-wave electromagnetic...
Analysis of boron doped hydrogenated amorphous silicon carbide thin film for silicon heterojunction solar cells
Salimi, Arghavan; Turan, Raşit; Department of Micro and Nanotechnology (2019)
Silicon based solar cells are the dominant type of solar cells in the photovoltaic industry. Recently, there have been increasing efforts to develop c-Si solar cells with higher efficiency and lower cost. Among them, silicon heterojunction solar cell (SHJ) is attracting much attention because of its superior performance values demonstrated at both R&D and industrial levels. One of the common limiting criteria is the recombination at the front side which can be solved by providing proper passivation at the f...
Citation Formats
E. G. Günbaş, L. K. Toppare, and G. Oklem, “New DPP and Selenophene based NIR Absorbing Polymers for Organic Solar Cell Applications,” presented at the International Conference on Photovoltaic Science and Technologies, (4 - 06 July 2018), Ankara, Türkiye, 2018, Accessed: 00, 2021. [Online]. Available: