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Here, rather than suppressing this pathway solely through excited\u2010state energetic engineering, we explore a spin\u2010manipulation strategy using intrinsically open\u2010shell non\u2010fullerene acceptors (NFAs) as spin\u2010active guest acceptors in OSC blends. Two (thio)barbituric acid\u2010terminated open\u2010shell NFAs, MAZ\u20101 and MAZ\u20102, were incorporated into D18:N3 solar cells. Electron spin resonance (ESR), variable\u2010temperature ESR, and variable\u2010temperature\n                    <jats:sup>1<\/jats:sup>\n                    H NMR measurements confirm their open\u2010shell character and thermally accessible triplet states. Upon MAZ incorporation, the ternary devices exhibit weakened high\u2010field magneto\u2010photocurrent responses and accelerated decay of long\u2010lived CT states, consistent with modulated CT\u2010state spin evolution and suppressed triplet\u2010related recombination. Consequently, the non\u2010radiative energy loss is reduced by up to \u223c20 meV, accompanied by enhanced charge transport, improved morphology, and a power conversion efficiency increase from 18.52% to 20.23%. This work establishes open\u2010shell guest acceptors as an intrinsic spin\u2010active platform for manipulating CT\u2010state spin dynamics and reducing non\u2010radiative recombination losses in OSCs.\n                  <\/jats:p>","DOI":"10.1002\/anie.2691122","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T13:36:07Z","timestamp":1785936967000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Open\u2010Shell Guest Acceptors Manipulate Charge\u2010Transfer Spin Dynamics in Organic Solar Cells"],"prefix":"10.1002","volume":"65","author":[{"given":"Junfeng","family":"Liu","sequence":"first","affiliation":[{"name":"Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology  Wuhan P. R. 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