Polymer solar cells (PSCs) have great potential in cost-effectiveness, large-scale printing preparation, lightweight flexibility and so on, which have attracted a lot of researchers' attention in the past 30 years. After considerable development, the maximum energy conversion efficiency (PCE) of PSCs using non fullerene receptors has exceeded 17%, which is closer to the threshold of commercialization than ever before. With the rapid improvement of PCE, the cost-effectiveness, device life and green processing of PSCs have become urgent questions. For cost-effectiveness, the synthesis complexity (SC) and figure of merit (FOM = SC / PCE) are the key measures, which directly reflect the relationship between input (SC) and output (PCE). PSCs with fullerenes as acceptors can estimate the merits and demerits of FOM only by comparing the SC of polymer donor. However, due to the huge difference in chemical structure of non fullerene receptor, it is necessary to incorporate the SC of non fullerene into the merger and comparison. In this paper, the average synthesis complexity (ASC) is obtained by weighting the mass fraction of donor and acceptor, and then the cost-effectiveness of the battery is evaluated by the average quality factor (AFOM = ASC / PCE).
Chen Junwu, State Key Laboratory of light emitting materials and devices, South China University of technology, used a small amount of alkoxy side chain with siloxane termination mixed with ordinary alkoxy side chain to replace the previous alkoxy side chain of low-cost polymer ptq10, and compared three kinds of siloxane content to obtain pqsi05, pqsi10 and pqsi25. Compared with ptq10, pqsi series polymers have stronger aggregation ability and lower film surface energy. PSCs made of it-4f, a non fullerene receptor, exhibit higher short-circuit current density (JSC) and filling factor (FF). PCE based on pqsi05: it-4f is up to 13.56%, while PCE based on ptq10: it-4f is 12.79%. In the statistical analysis of cost-benefit, SC includes five variables: synthesis step, synthesis yield, separation and purification, chromatography column and harmful chemicals. These five variables are very important for the cost control of large-scale production of materials. Pqsi05 only uses 5% siloxane side chain unit, SC is very close to ptq10. In this paper, pqsi05 is well matched with it-4f with low SC, and finally a striking low ASC and low AFOM is obtained. The statistical analysis of ASC and AFOM shows that pqsi05: it-4f system is quite competitive.
Relevant papers were published online on solar RRL (DOI: 10.1002/solr.202000062).
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