The characterization of chloroboron (iii) subnaphthalocyanine thin films and their application as a donor material for organic solar cells

Verreet, Bregt; Schols, Sarah; Cheyns, David; Rand, Barry P.; Gommans, Hans; Aernouts, Tom; Heremans, Paul; Genoe, Jan

doi:10.1039/b902342a

Cited by 57 publications

(52 citation statements)

References 23 publications

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“…This suggests that C 60 here functions as an ETL, analogous to the C 60 layer in our previously published devices with a fl uorinated SubPc dimer as an acceptor. [ 14 ] We tested this assertion by replacing C 60 /BCP with other transport layers ( Table 1 ) that combine the desirable properties of high conductivity, low optical absorption and exciton blocking. By doping the BCP layers with Yb [ 24 ] or C 60 , [ 25 ] we were able to ensure a suffi cient optical spacer thickness without compromising the transport In device D, SubNc thickness was regrettably thicker than optimal, leading to a suboptimal FF = 58%.…”

Section: Absorption Effi Ciency and Exciton Diffusion Effi Ciencymentioning

confidence: 98%

“…Previously used as a donor material, SubNc combines strong red absorption (extinction coeffi cient k peaks at 1.4 for a wavelength λ = 686 nm, absorption edge at λ = 730 nm) with an open-circuit voltage of V oc ≈ 0.8 V when combined with C 60 . [ 14 ] The SubNc/C 60 HJ was therefore subsequently utilized as the red-absorbing subcell of a tandem device. [ 15 ] Moreover, while small molecule based solar cells are often processed via vacuum thermal evaporation, SubNc can also be processed from solution.…”

Section: Dip As An Exciton Blocking Htlmentioning

confidence: 99%

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Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Verreet

Cnops

Cheyns

et al. 2014

Advanced Energy Materials

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An optimization of several aspects of planar heterojunction solar cells based on boron subnaphthalocyanine chloride (SubNc) as a donor material is presented. The use of hexachlorinated boron subphthalocyanine chloride (Cl6SubPc) as an alternative acceptor to C60 allows for the simultaneous increase of the short‐circuit current, fill factor, and open‐circuit voltage compared to cells with fullerene acceptors. This is due to the complementary absorption of Cl6SubPc versus SubNc, reduced recombination at the heterointerface, and improved energetic alignment. Furthermore, insertion of a thin diindeno[1,2,3‐cd:1′,2′,3′‐lm]perylene (DIP) layer at the anode results in a very significant 60% increase in photocurrent owing to reduced exciton quenching at the anode. The simultaneous improvement of all three solar cell parameters results in a power conversion efficiency of 6.4% for a non‐fullerene planar heterojunction cell.

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Section: Absorption Effi Ciency and Exciton Diffusion Effi Ciencymentioning

confidence: 98%

Section: Dip As An Exciton Blocking Htlmentioning

confidence: 99%

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Verreet

Cnops

Cheyns

et al. 2014

Advanced Energy Materials

Self Cite

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show abstract

“…Fused acenes [34][35][36][37][38][39][40][41][42][43] and several famous classes of dyes, such as phthalocyanine (Pc), [20, subphthalocyanine (SubPc), [66][67][68][69][70][71] subnaphthalocyanine (SubNc), [72,73] merocyanine (MC), [74] cyanine dyes, [75][76][77][78][79] and squaraine (SQ), [80][81][82][83] are widely used in LL vacuum deposited OPVs (Figure 2, Table 1). In 2001, Forrest and Peumans fabricated bilayer heterojunction OPVs based on CuPc and C 60 with a PCE of 3.6% under 150 mW cm −2 simulated AM1.5G illumination.…”

Section: Bilayer Structurementioning

confidence: 99%

Layer‐by‐Layer Processed Organic Solar Cells

Wang

Zhan

2016

Advanced Energy Materials

102

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Layer‐by‐layer (LL) processes, i.e., sequential deposition of different active layers, are widely used in the fabrication of organic solar cells (OSCs). Recently, LL vacuum deposition and LL solution processes have attracted considerable attention. LL processing presents some advantages over the blend method: a) donor and acceptor layers can be easily and independently controlled and optimized; b) the charge carriers dissociated from excitons at the donor–acceptor interface are confined to each phase, so bimolecular recombination losses can be reduced; c) bilayer geometries enable an easier way for understanding the physical processes taking place at the donor–acceptor interface; d) desired vertical phase separation for charge extraction can be obtained through changing the sequence of donor and acceptor deposition. This report summarizes the recent developments of LL processed OSCs. The remaining problems and challenges, and the key research direction in near future are discussed.

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“…The latter interference pattern can be precisely calculated and it corresponds to the exciton generation rate within the whole structure [28][29][30]. Therefore the enhancement of photocurrent might be possible, at least for planar heterojunction cells, through the modulation of the thicknesses of the layers [31,32]. In the next paragraphs we will resume the critical points of the other three steps of the working sequence of an OPV.…”

Section: Absorption Efficiencymentioning

confidence: 97%

Organic Solar Cells: Problems and Perspectives

Chidichimo

Filippelli

2010

International Journal of Photoenergy

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For photovoltaic cells to convert solar into electric energy is probably the most interesting research challenge nowadays. A good efficiency of these devices has been obtained by using inorganic semiconductor materials. On the other hand, manufacture processes are very expensive in terms of both materials and techniques. For this reason organic-based photovoltaic (OPV) cells are attracting the general attention because of the possible realization of more economical devices. Organic materials are abundant and easily handling. Unfortunately OPV cells efficiency is significantly lower than that of inorganic-based devices, representing a big point of weakness at the present. This is mainly due to the fact that organic semiconductors have a much higher band gap with respect to inorganic semiconductors. In addition, OPV cells are very susceptible to oxygen and water. In this paper we will describe some of the different approaches to the understanding and improving of organic photovoltaic devices.

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The characterization of chloroboron (iii) subnaphthalocyanine thin films and their application as a donor material for organic solar cells

Cited by 57 publications

References 23 publications

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Layer‐by‐Layer Processed Organic Solar Cells

Organic Solar Cells: Problems and Perspectives

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