Performance evaluation of PTB7 : PC₇₁BM based organic solar cells fabricated by spray coating method using chlorine free solvent

Abstract

The PTB7:PC 71 BM polymer based solar cells have been successfully fabricated by spin and spray coating technique using chlorine-free solvent (xylene), which are desirable to reduce environmental issues. The surface morphology of fabricated film characterized by AFM reveals that the surface morphology of the film is uniform and smooth when xylene is used as compared with chlorobenzene. The highest power conversion efficiency (PCE) (5.07±.6) was achieved using spray-coating technique than that of spin coating technique (PCE of 4.47±.6). The enhancement in the performance of the polymer solar cell could be attributed to the improved charge carrier transportation due to additive. The combination of chlorine-free solvent and spraycoating method minimize the waste material and reduce the environmental problem in large-area production of organic solar cells (OSCs). and without DIO. From this Table 2, the OTFSC prepared in xylene with 3% DIO exhibits higher PCE =5.07% than without DIO (PCE =2.90%). This implies that the addition of DIO in active layer reveals increase in the J sc =12.07 mA/cm 2 , FF=56 %, R sh =398 Ω cm 2 and decreases the R s =5.5 Ω cm 2 , as a result of drastic improvement in the PCE =5.07% than without DIO, PCE=2.90%. Figure 5. J-V characteristics of PTB7:PC 71 BM based OSC devices with and without DIO using spray coating method.The AFM studies reveals that the pristine xylene exhibits larger surface aggregates due to improper mixing between donor and acceptor, which will diminish exciton migration and is not

Poly(vinyl pyrrolidone)-modified metal oxide anode interlayers for stable organic solar cells

“…Rough surfaces of PTB7∶PC 71 BM layers can improve the internal reflection in the active layer, which can lead to increased device efficiency. 47…”

“…The increment in surface roughness which is required to improve internal reflection in the active layer. 47…”

Well-Dispersed Cu2ZnSnS4 Nanocrystals Synthesized from Alcohols and Their Applications for Polymer Photovoltaics

“…Recently, PSCs with a high power conversion efficiency (PCE) of ~10% have been fabricated in laboratories by many groups by employing new organic photovoltaic materials including conducting polymers [4, 5] and non-fullerene (NF) acceptors [6]. Nerveless, the large-scale fabrication of commercially viable PSCs is still unsatisfactory [7, 8]. Large-scale preparation methods such as conventional doctor-blading, brush-painting, spray-coating, screen, and ink-jet printing cannot provide as efficient PSCs as laboratory-derived spin-coated photovoltaic devices.…”

Células fotovoltaicas orgânicas do tipo heterojunção de volume fabricadas a partir de solventes não halogenados >/sub<

“…Comparação SRINIVASAN et al, 2015;ZHANG et al, 2016;ZHOU et al, 2016). Adição do 1,8-diiodoctano (DIO) (aditivo) na solução para a deposição da camada ativa ajuda a garantir uma morfologia adequada dos filmes, pois garante a solubilidade e a dispersão homogênea do material aceitador de elétrons, o que evita a aglomeração de grandes domínios segregados do PC 71 BM na matriz polímero/fulereno (GUO et al, 2017;LOW et al, 2011).…”

“…Adição do 1,8-diiodoctano (DIO) (aditivo) na solução para a deposição da camada ativa ajuda a garantir uma morfologia adequada dos filmes, pois garante a solubilidade e a dispersão homogênea do material aceitador de elétrons, o que evita a aglomeração de grandes domínios segregados do PC 71 BM na matriz polímero/fulereno (GUO et al, 2017;LOW et al, 2011). Proporcionando a desejada separação de fase entre o doador e o aceitador conferindo uma nanomorfologia favorável para a geração de fotocorrente e consequentemente na melhora do desempenho fotovoltaico (SRINIVASAN et al, 2015). As concentrações na faixa de 3% a 5% em volume são comumente encontradas como as concentrações ótimas de aditivo (DIO) para melhorar o transporte de carga em dispositivos BHJs (LI et al, 2011;LIANG et al, 2010 Figura 40-Curvas de J-V, sob iluminação, referentes aos dispositivos PTB7-Th:PC 71 BM proporção (1:1), no qual foram fabricados nas concentração de 10 mg/mL, 20 mg/mL e 35 mg/mL utilizando 5% de DIO.…”