Synthesis of conjugated polymers bearing indacenodithiophene and cyclometalated platinum(II) units and their application in organic photovoltaics

Triplet Tellurophene‐Based Acceptors for Organic Solar Cells

“…[10] Thus,t he efficiency of OSCs is the combination of the efficiencyo fe ach step.C learly,o ne effective strategy to improve the efficiencyi st oi ncrease the exciton diffusion distances to enhance excitons dissociating into free carriers at donor/acceptor interfaces before recombination. [12,13] However, the precise mechanism behind the triplet exciton roles in OSCs remains unclear, [13][14][15][16][17][18][19] so it is essential to further investigate triplet materials.O ne important strategy to achieve triplet state materials is to introduce heavy atoms into the conjugated materials chemically or physically, [20][21][22][23][24][25][26] which may lead to efficient intersystem crossing. [12,13] However, the precise mechanism behind the triplet exciton roles in OSCs remains unclear, [13][14][15][16][17][18][19] so it is essential to further investigate triplet materials.O ne important strategy to achieve triplet state materials is to introduce heavy atoms into the conjugated materials chemically or physically, [20][21][22][23][24][25][26] which may lead to efficient intersystem crossing.…”

Triplet Tellurophene‐Based Acceptors for Organic Solar Cells

“…[11] Triplet state materials provide sufficient time for charge transfer (CT) state to dissociate into free charges instead of net recombination when the triplet state energy is higher than the energy level of CT state. [12,13] However, the precise mechanism behind the triplet exciton roles in OSCs remains unclear, [13][14][15][16][17][18][19] so it is essential to further investigate triplet materials.O ne important strategy to achieve triplet state materials is to introduce heavy atoms into the conjugated materials chemically or physically, [20][21][22][23][24][25][26] which may lead to efficient intersystem crossing. Thus,different metallic elements,s uch as iridium and platinum, [22,24,26] have been incorporated into conjugated donor materials,a ffording enhanced efficient OSCs.H owever,t riplet non-fullerene acceptors have never been developed for bulk heterojunction OSCs,t hough these materials have demonstrated their potential for OSCs over the past few years.…”

Dramatic Enhancement of Power Conversion Efficiency in Polymer Solar Cells by Conjugating Very Low Ratio of Triplet Iridium Complexes to PTB7

“…According to previous results, polymer BHJ solar cells employing heavy metal complexes exhibited PCE no less than 3% . It should be noted that BHJ PSCs with PCE over 6% reported so far are all based on singlet CT state dominated pure organic materials .…”

“…Adding a small amount of pqIrpicNa and PEO to P3HT/PC 61 BM solar cell devices, resulted in 20% and 10% increase in the short circuit current ( J SC ) and PCE, respectively, compared to the reference device without additives . Besides, Cheng and co‐workers also reported a series of conjugated polymers bearing indacenodithiophene and cyclometalated platinum complexes, when blended with PC 71 BM, a maximum PCE of 2.9% was obtained …”