Organic Salts as p-Type Dopants for Efficient LiTFSI-Free Perovskite Solar Cells

QC 20201007
Despite the ubiquity and importance of organic hole-transport materials in photovoltaic devices, their intrinsic low conductivity remains a drawback. Thus, chemical doping is an indispensable solution to this drawback and is essentially always required. The most widely used p-type dopant, FK209, is a cobalt coordination complex. By reducing Co(III) to Co(II), Spiro-OMeTAD becomes partially oxidized, and the film conductivity is initially increased. In order to further increase the conductivity, the hygroscopic co-dopant LiTFSI is typically needed. However, lithium salts are normally quite hygroscopic, and thus, water absorption has been suggested as a significant reason for perovskite degradation and therefore limited device stability. In this work, we report a LiTFSI-free doping process by applying organic salts in relatively high amounts. The film conductivity and morphology have been studied at different doping amounts. The resulting solar cell devices show comparable power conversion efficiencies to those based on conventional LiTFSI-doped Spiro-OMeTAD but show considerably better long-term device stability in an ambient atmosphere.

Zhang, FuguoKTH,Organisk kemi(Swepub:kth)u1dddr0z (författare)
Xu, BoKTH,Organisk kemi(Swepub:kth)u15ablkf (författare)
Li, YuanyuanKTH,Fiber- och polymerteknologi,Wallenberg Wood Science Center(Swepub:kth)u1bpdtr4 (författare)
Wang, LinqinKTH,Organisk kemi(Swepub:kth)u17gihxs (författare)
Zhang, BiaobiaoKTH,Organisk kemi(Swepub:kth)u1lxnvcf (författare)
Guo, YuKTH,Tillämpad fysikalisk kemi(Swepub:kth)u140q4oh (författare)
Gardner, James M.,1982-KTH,Tillämpad fysikalisk kemi(Swepub:kth)u1r55ysm (författare)
Sun, Licheng,1962-KTH,Organisk kemi,Molekylär elektronik, CMD,Dalian Univ Technol DUT(Swepub:kth)u1umfd9h (författare)
Kloo, LarsKTH,Tillämpad fysikalisk kemi(Swepub:kth)u1jrdr1m (författare)
KTHTillämpad fysikalisk kemi (creator_code:org_t)

Ingår i:ACS Applied Materials and Interfaces: American Chemical Society (ACS)12:30, s. 33751-337581944-82441944-8252

Av författaren/redakt...: Zhang, Wei; Zhang, Fuguo; Xu, Bo; Li, Yuanyuan; Wang, Linqin; Zhang, Biaobiao; visa fler...; Guo, Yu; Gardner, James M ...; Sun, Licheng, 19 ...; Kloo, Lars; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.